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Original Article
Epidemiology Insulin Resistance and the Risk of Diabetes and Dysglycemia in Korean General Adult Population
Jong Ha Baek1, Hosu Kim1, Kyong Young Kim1, Jaehoon Jung1,2orcid
Diabetes & Metabolism Journal 2018;42(4):296-307.
Published online: April 24, 2018
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1Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine, Changwon, Korea.

2Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Korea.

Corresponding author: Jaehoon Jung. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University School of Medicine, 11 Samjeongja-ro, Seongsan-gu, Changwon 51472, Korea.
• Received: December 27, 2017   • Accepted: March 2, 2018

Copyright © 2018 Korean Diabetes Association

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

  • Background
    Insulin resistance is a major pathogenic hallmark of impaired glucose metabolism. We assessed the accuracy of insulin resistance and cut-off values using homeostasis model assessment of insulin resistance (HOMA-IR) to classify type 2 diabetes mellitus (T2DM) and dysglycemia according to age and sex.
  • Methods
    In this cross-sectional study, we analyzed 4,291 anti-diabetic drug-naïve adults (≥20 years) from the 6th Korea National Health and Nutrition Examination Survey in 2015. Metabolic syndrome (MetS) was defined by the modified National Cholesterol Education Program III guideline. Diagnosis of dysglycemia and T2DM were based on fasting glucose and glycosylated hemoglobin levels. The receiver operating characteristic curve and optimal cut-off values of HOMA-IR were assessed to identify T2DM/dysglycemia according to sex and were further analyzed by age.
  • Results
    Sex differences were found in the association of MetS and the different MetS components with T2DM/dysglycemia. The overall optimal cut-off value of HOMA-IR for identifying dysglycemia was 1.6 in both sex. The cut-off values for T2DM were 2.87 in men and 2.36 in women. However, there are differences in diagnostic range of HOMA-IR to distinguish T2DM according to sex and age, and the accuracy of HOMA-IR in identifying T2DM gradually decreased with age especially in women.
  • Conclusion
    Insulin resistance is closely associated with the risk for T2DM/dysglycemia. The accuracy of HOMA-IR levels is characterized by sex- and age-specific differences in identifying T2DM. In addition to insulin resistance index, insulin secretory function, and different MetS components should be considered in the detection of early T2DM, especially in elderly.
A progressive decline in insulin sensitivity plays a crucial role in the pathogenesis of metabolic syndrome (MetS). Impaired β-cell compensation in response to increased insulin resistance is a pathophysiological factor associated with poor glucose tolerance. In addition, prediabetic state, including impaired fasting glucose and/or impaired glucose tolerance (IGT) is a pathological feature of insulin resistance in insulin-sensitive organs [1].
According to data from the National Health Insurance Service, about 2.7 million Korean (8.0%) aged 30 years or older had type 2 diabetes mellitus (T2DM) [2] and the prevalence of diabetes or cardiometabolic disease rises with age and shows sex differences [3]. In addition, ethnic differences exist in the stabilization points of insulin resistance and insulin secretory function for maintenance of normal glucose tolerance (NGT) [4]. Asian population is highly vulnerable to increased insulin resistance due to decreased β-cell function in NGT conditions [5]. Homeostasis model assessment of insulin resistance (HOMA-IR) has been used widely in epidemiologic studies to measure insulin sensitivity based on fasting plasma glucose (FPG) and insulin concentrations [6]. HOMA-IR also correlates reasonably well with insulin resistance measured by hyperinsulinemic-euglycemic clamp, which is regarded as the gold standard but is not readily applicable because of complex process [7]. Meanwhile, in addition to sex- and age-specific differences in HOMA-IR range [8], the HOMA-IR value increases significantly from 50 years of age in women without diabetes [910].
According to data from the 2013 to 2014 Korea National Health and Nutrition Examination Survey (KNHANES), 29.3% of Korean patients still did not aware of their diabetic condition. The index of insulin resistance represents a screening tool for the identification of subjects who were at increased risk for diabetes or dysglycemia. A previous study showed that increase in HOMA-IR was positively associated with higher risk of T2DM in Japanese population with impaired insulin secretion [11]. In a prospective cohort studies, HOMA-IR cut-off values of 1.4 and 2.0 were used to distinguish dysglycemia and T2DM from NGT in Chinese population [12]. Meanwhile, the HOMA-IR cut-off values of 1.85 for women and 2.17 for men were used to distinguish T2DM among Iranian adults [13]. Previous Asian studies also demonstrated that distribution and cut-off values of HOMA-IR for insulin resistance were 2.2 to 2.5 in Korean population [14] and 2.5 in Japanese population [9]. However, age- and sex-specific metabolic risk factors were not considered in previous studies. Insulin secretory function also should be considered in the classification of T2DM or dysglycemia in the general population. We therefore, conducted this study to evaluate the distribution and optimal HOMA-IR cut-off values according to sex and age to facilitate the detection of insulin resistance associated with early T2DM or dysglycemia in Korean adult population.
Study design and population
This study was performed using data from the 6th KNHANES conducted in 2015 involving 7,380 individuals aged 1 and above. KNHANES is a population-based cross-sectional survey designed to assess the health-related behavior, health condition, and nutritional state of Koreans [15]. Each survey was conducted by specially trained interviewers and the data was collected by direct and standardized physical examinations in specially equipped mobile examination centers. A representative sample of non-institutionalized civilians was obtained from all geographic regions in the country; subjects were selected using a rolling cluster sampling design, stratified into multiple stages, and prorated by age. Participants provided written informed consent to participate at the time of enrollment, and we received the data in anonymized form. The KNHANES VI study was conducted according to the principles expressed in the Declaration of Helsinki and Ethnics approval was obtained from the Korea Centers for Disease Control and Prevention Institutional Review Board Ethnic committee with informed consents (No. 2015-01-02-6C) [16].
We restricted the analyses to adults aged 20 years and above (n=5,855). Subjects with missing data for variables associated with MetS components (waist circumference [WC], blood pressure [BP], lipid profiles, and fasting glucose levels) or fasting insulin and glycosylated hemoglobin (HbA1c) levels were excluded (n=1,081). In addition, those who responded with ‘yes’ to the questionnaire of “Have you ever been diagnosed with diabetes by a doctor and taken anti-diabetic drugs before?” were excluded to rule out the effect of anti-diabetic drugs on insulin sensitivity (n=502). The anti-diabetic drug-naïve adult population was divided into three categories (NGT, prediabetes, and T2DM) according to the American Diabetes Association diagnostic criteria for diabetes [17]. Only FPG and HbA1c levels were used for diagnostic cut-off values because 75-g oral glucose tolerance test was not performed in this survey. Those with FPG less than 100 mg/dL and HbA1c less than 5.7% were defined to have NGT, and those with FPG of 126 mg/dL or more, or HbA1c of 6.5% or greater were diagnosed with T2DM. Meanwhile, those with FPG levels ranging between 100 and 125 mg/dL or HbA1c levels between 5.7% and 6.4% were identified as prediabetes. In our study, dysglycemia referred to pre-diabetes and T2DM, and non-T2DM referred to NGT and pre-diabetes. Plasma glucose and insulin levels under fasting condition were measured to evaluate insulin sensitivity using HOMA-IR and insulin secretory function using homeostasis model assessment of β-cell function (HOMA-β) model [6]. HOMA-IR levels were divided into tertiles according to glycemic state (NGT subgroup, dysglycemia subgroup) to assess the severity of insulin resistance in which the higher tertiles suggested greater insulin resistance.
General characteristics and anthropometric factors
We included sociodemographic characteristics including age, sex, education (high school or less, college or higher), smoking status (current smoker or not), exercise, and alcohol intake. We defined regular aerobic exercise if it involved moderate intensity for 2.5 hours or more or intense exercise for 1.25 hours or more per week. Heavy alcohol intake was defined by the amount and frequency of alcohol for a month. Binge drinking was defined as five or more alcoholic drinks in males or four or more alcoholic drinks in females at least once daily in the past month. WC was measured to the nearest 0.1 cm on a horizontal plane at the mid-point between the lower costal margin and the iliac crest. Weight (kg) was divided by height squared (m2) to calculate the body mass index. BP was measured three times at 5-minute intervals using a standard mercury sphygmomanometer with the subject seated. The mean of the second and third measurements was calculated and used in the analysis. Blood samples were collected after the subject had fasted for more than 8 hours. The fasting serum levels of glucose, triglyceride (TG), and high density lipoprotein cholesterol (HDL-C) were measured enzymatically using a Hitachi Automatic Analyzer 7600 (Hitachi, Tokyo, Japan).
Definition of MetS
MetS was defined according to the modified criteria proposed by the Adult Treatment Program III of the National Cholesterol Education Program (NCEP ATP III) [18]. Each MetS component was evaluated using the following criteria: (1) WC ≥90 cm in men or ≥85 cm in women (for Korean population) [19]; (2) TG ≥150 mg/dL or statin treatment; (3) HDL-C cholesterol <40 mg/dL in men or <50 mg/dL in women or statin treatment; and (4) elevated BP (systolic blood pressure [SBP] ≥130 mm Hg and/or diastolic blood pressure ≥85 mm Hg) or treatment with anti-hypertensive medications. Meanwhile, hyperglycemia was not considered because subjects with a history of anti-diabetic drug regimen were excluded from the study design.
Statistical analysis
Normally distributed data were presented as mean±standard deviation, and non-normally distributed date were presented as median (interquartile range [IQR]). Student t-test or one-way analysis of covariance was used for continuous variables and chi-square tests were used for categorical variables to assess the baseline characteristics. The Mann-Whitney U test, Kruskall-Wallis test, and the Jonckheere-Terpstra test (for trend analyses) were used for comparison of quantitative variables. Multivariate logistic regression analyses was conducted to identify the risk of T2DM/dysglycemia associated with the MetS components after adjusting for age and lifestyle components (regular aerobic exercise, education state, smoking status, heavy drinker) and HOMA-IR cut-off value.
To determine the optimal HOMA-IR cut-offs to distinguish dysglycemia from NGT, and T2DM from non-DM according to age group, the point with the maximum Youden index (sensitivity+specificity−1; YI) on the receiver-operating characteristic operation (ROC) curve was obtained, and we selected the maximum value as the cut-off values. The effect of age groups on total area under the ROC curve (AUROC) differences was analyzed using the independent ROC comparison analysis according to sex. In addition, to assess for linearity of AUROCs by age groups, we conducted the restricted maximum likelihood estimation using area under the curve (AUC) values and standard errors. The total AUROC with 95% confidence interval (CI), sensitivity, and specificity of HOMA-IR values were calculated to distinguish dysglycemia from T2DM, respectively. The statistical analyses was performed using SPSS version 21.0 (IBM Co., Armonk, NY, USA), Stata version 14.1 (StatCorp., College Station, TX, USA), and MedCalc version 17.5.5 (MedCalc Software bvba, Ostend, Belgium). All statistical tests were two-tailed, and the significance level was set at P<0.05.
General characteristics
The baseline characteristics of study population are shown in Table 1 and subjects were subdivided into NGT, pre-diabetes, and T2DM according to sex (Supplementary Table 1). In the total study population of 4,291 adults mean age was comparable between sex (mean, 50.5 years). Among MetS components, central obesity (31.7% vs. 28.0%), hyperTG (37.2% vs. 21.1%), and higher BP (46.9% vs. 34.6%) were dominant factors in men whereas low HDL-C (26.0% vs. 40.0%) were dominant in women (all P<0.01). Current smoking and binge drinking were more dominant in men whereas less regular exercise and lower educational status were observed in women (all P<0.001). The overall prevalence of T2DM was 6.5% (n=120) in men and 3.9% (n=95) in women (P<0.001). The overall prevalence of dysglycemia was 50.7% (n=938) in men and 40.3% (n=984) in women (P<0.001). Meanwhile, sex differences in prevalence were seen across different age groups. The prevalence of T2DM was higher in men than in women under 60 years although it was not significant in older ages as the prevalence in women increased gradually with age. The prevalence of dysglycemia was higher in men aged 40 to 60 years compared with women (Fig. 1). The overall median HOMA-IR levels were 1.56 in men and 1.44 in women (P=0.003). However, the median HOMA-IR values according to glucose tolerance state (NGT, prediabetes, and T2DM) and age were not significantly different between males and females (data not shown). T2DM was prevalent in older population with having more MetS components, and higher insulin resistance and lower insulin secretory function compared to those with NGT or pre-diabetes, as expected in both men and women (Supplementary Table 1).
The risk of T2DM/dysglycemia associated with MetS components according to sex
To evaluate the effects of MetS components on the risk of T2DM/dysglycemia according to sex, multivariate logistic regression analyses was performed adjusting for HOMA-IR cut-off values (YI) and lifestyle factors (regular aerobic exercise, education state, smoking state, and heavy drinking). In men, the presence of hyperTG was associated with increased risk for T2DM (odds ratio [OR], 2.14; 95% CI, 1.31 to 3.50) and dysglycemia (OR, 1.61; 95% CI, 1.24 to 2.08) after adjusting for confounding factors. Meanwhile, the presence of hypo-HDL cholesterol (OR, 2.40; 95% CI, 1.13 to 5.07) was associated with the risk for T2DM in women (Table 2).
AUROC distribution and cut-off values of HOMA-IR by age, sex, and dysglycemic state
The AUROC curve of HOMA-IR values was used to distinguish dysglycemia from NGT, and T2DM from non-DM as shown in Table 3. The overall AUROC for T2DM was 0.774 (95% CI, 0.730 to 0.818) for men and 0.837 (95% CI, 0.794 to 0.879) for women, and those for dysglycemia were 0.685 (95% CI, 0.671 to 0.719) for men and 0.728 (95% CI, 0.708 to 0.748) for women. The optimal cut-off values for dysglycemia were 1.56 (sensitivity 64.3%, specificity 64.5%), and 1.60 (sensitivity 63.3%, specificity 70.0%) in women, without any differences in accuracy of HOMA-IR values according to age in both sex (Fig. 2). Meanwhile, the cut-off point of 1.6 in both sex was strongly associated with each MetS component after adjusting for age and lifestyle factors (alcohol intake, education state, and exercise) (Table 4).
The optimal cut-off values using maximum YI for T2DM were 2.87 in men (sensitivity 56.7%, specificity 85.4%), and 2.36 in women (sensitivity 72.6%, specificity 79.9%). In subgroups according to age and sex (Table 5), significant differences in AUROC for T2DM were found across different age groups in both sex, whereas the linear decline with aging was significant only in women (P<0.05). In men in their 60s, the sensitivities of HOMA-IR cut point for T2DM diagnosis were 40.5% (YI criteria, 2.87) and 43.2% (2.5 criteria), respectively. Among men in their 70s, the sensitivities of HOMA-IR cut point for T2DM were 57.1% (YI index criteria) and 46.4% (2.5 criteria), respectively. When we excluded subjects who were aged 70 years or older, the cut-off value for HOMA-IR was 2.13 (sensitivity 85.5%, specificity 69.9%) in men and 2.50 in women (sensitivity 85.7%, specificity 74.4%) (data not shown).
Meanwhile, among subjects with dysglycemic state (n= 1,922), an overall defect in insulin secretory function (HOMA-β) in older subjects aged above 50s was observed only in middle (median [IQR], 60.0 [45.9 to 70.0] vs. 51.4 [41.3 to 62.7], P=0.012) to high tertiles (median [IQR], 101.2 [75.8 to 150.5] vs. 85.2 [66.6 to 121.0], P=0.003) of HOMA-IR in men, and high tertiles of HOMA-IR in women (median [IQR], 109.5 [80.4 to 146.1] vs. 99.5 [74.6 to 128.1], P=0.045) compared to those at younger ages (Fig. 3).
In this large community-based Korean adult population study, differences in MetS expression were found and the different MetS components were independently associated with the risk of T2DM/dysglycemia after adjusting for lifestyle factors and insulin resistance between men and women. The optimal cut-off value of HOMA-IR using maximum YI for dysglycemia was 1.6 in both sex, and this value was independently associated with MetS components. The cut-off values of HOMA-IR for T2DM were 2.87 in men and 2.36 in women. Meanwhile, the diagnostic ranges of HOMA-IR to discriminate T2DM varied according to sex and age, and the sensitivity of HOMA-IR for T2DM diagnosis progressively decreased with age especially in women. An impaired compensatory insulin secretory function in older subjects with dysglycemic state was predominantly seen under conditions of higher insulin resistance. The findings suggest that factors such as age, sex, different MetS components, and insulin secretory function should be considered to classify people with high-risk T2DM using HOMA-IR cut-off values, especially in older Koreans.
Sex differences in MetS expression and the association of different MetS components with the risk of T2DM/dysglycemia were found. In this study, among the MetS components, central obesity, high TG, and BP were more dominant in men than in women, whereas low HDL-C was predominant in women. In addition, low HDL in women or high TG in men was significantly associated with the risk for dysglycemia/T2DM after adjusting for the confounding factors such as HOMA-IR and lifestyle factors. A national cross-sectional survey conducted in the United States [20] demonstrated that MetS was a heterogeneous entity associated with age and sex variation in component clusters, and different combinations of MetS components were associated with mortality risk rather than the number of MetS components or the presence of MetS itself. In addition, low-HDL-C increased the risk of T2DM in epidemiologic studies [2122]. Meanwhile, lifestyle factors including alcohol consumption [23], exercise [24], and smoking [25] were also closely associated with MetS. As a result, we further considered these lifestyle confounding factors and found a significant correlation between sex differences in MetS components and the risk for T2DM/dysglycemia in this study. The finding suggested that the presence of MetS as well as different components related to sex are closely associated with the risk for T2DM or dysglycemia in general population.
HOMA-IR cut-off point for dysglycemia was 1.6 for both sex in our study population. Insulin resistance is a major pathophysiological feature associated with the risk for MetS, T2DM, and overall mortality risk, and is useful as a prognostic indicator to facilitate early diagnosis of dysglycemia or T2DM. However, previous studies to identify the association between insulin resistance indices with the risk for cardiometabolic disease showed various results. Several cross-sectional large population studies reported various cut-off values to discriminate MetS (HOMA-IR, 1.7 to 3.8) according to the study population, sample size, and diagnostic criteria for insulin resistance [26]. HOMA-IR ≥2.5 was also suggested as the cut-off value for insulin resistance by Japan Diabetes Society [27] and the value of 1.7 was suggested as a cut-off for identifying subjects with high risk for MetS in Japanese studies [28]. As a marker of early stage pre-diabetes (FPG >100 mg/dL or HbA1c >5.7%) in our study, the cut-off value of HOMA-IR (1.6) was similar to the value used to distinguish MetS risk in a Japanese study [28]. In addition, the HOMA-IR cut-off in our study for dysglycemia was also independently associated with each MetS component (OR, 2.03 to 7.61 according to MetS factors and sex) regardless of age and lifestyle factors. It may suggest that this HOMA-IR cut-off point could be another option for early detection of dysglycemia and risk for accompanying MetS components. Of course, from the perspective of diabetes and MetS prevention, the sensitivity and the specificity of the test were around 60% to 70% and adoption of single HOMA-IR cut-off value of 1.6 was not adequate to completely replace other risk factors. As a result, the cut-off values for HOMA-IR might not be represent stringent guideline for the early detection of IGT. However, they can aid our understanding of the clinical complexity of the patients with the highest risk for developing diabetes or MetS.
In our study, the overall accuracy of HOMA-IR values in identifying T2DM varied between men and women. A significant effect of age on the diagnostic performance of HOMA-IR was observed as the accuracy of insulin resistance index in T2DM diagnosis progressively decreased with aging especially in women. In addition, sensitivity was lower than 50% in elderly men (≥60 years) and lower than 60% in elderly women (≥70 years) based on HOMA-IR cut-off value. Meanwhile, among subgroups of dysglycemia (n=1,922) manifesting higher insulin resistance levels than the NGT group, a significantly lower level of HOMA-β was observed in older subjects (≥50 years) under higher insulin resistance (highest tertiles of HOMA-IR). Previous reports suggested age- and sex-specific differences in HOMA-IR distribution in subjects with non-diabetic state [814], and different AUC and cut-off values of HOMA-IR were observed in identifying MetS according to age and sex, especially in women [10]. Therefore, a single one-point cut-off value is not adequate for early detection of severe cardiometabolic risk. Impairment of compensatory pancreatic β-cell response to insulin resistance results in dysglycemia or overt T2DM and subjects were more vulnerable to insulin resistance with increasing age. Previous studies reported a decrease in fasting insulin with advancing age, which is associated with blunted insulin secretion or limited β-cell function [2930]. In addition, postmenopausal women tend to be more vulnerable to insulin resistance as estrogen deficiency induces central obesity with changed body composition [31]. Meanwhile, in a study of healthy Iranian population, age, WC, and SBP were biological determinants of fasting insulin in both sex and insulin secretion was further modulated by different MetS components according to sex (TG in men and FPG in women) [30]. In addition, the association between increasing HOMA-IR value over time and the development of T2DM was observed in subjects with impaired insulin secretion but not in those with normal secretory function [11]. In addition to insulin resistance, pancreatic insulin secretory function should be considered to assess the pathophysiology and risk for T2DM, especially in elderly populations.
There are some limitations in our study. First, HOMA-IR mostly reflects hepatic insulin resistance and did not fully represent insulin resistance unlike the euglycemic clamp [32]. Second, defining dysglycemia or T2DM in our study was assessed by FPG or HbA1c levels without considering postprandial glucose levels because of the study design. Because of the relative predominance of postprandial glucose excursions in early T2DM [33], there is a possibility that some people with IGT were not included in the dysglycemic group. However, we considered HbA1c levels for diagnosis of T2DM or pre-diabetes in which HbA1c was closely associated with postprandial glucose levels rather than FPG [34]. Third, the cross-sectional study design prevented a comprehensive evaluation of the periodic changes in anthropometric and lifestyle factors to determine the causal relationship between insulin resistance and the incidence of dysglycemia or T2DM. Even though we excluded subjects who already took anti-diabetic drugs to minimize confounding effects that affect insulin resistance and secretory function, it could be crucial limitation because this study did not represents the whole Korean population and selection bias could affects the results. However, we tried to determine the cut-off values in healthy Korean population selected from this non-institutionalized population-based study and other lifestyle factors (smoking, exercise, and education) were also considered to evaluate to relationship between insulin resistance and MetS or impaired glucose metabolism. A future large prospective study should be performed to generalize this cut-off values and the risk for impaired glucose metabolism.
In conclusion, a HOMA-IR cut-off value of 1.6 in both sex was significantly associated with the risk for dysglycemia as well as MetS components in Korean population regardless of age. The cut-off values of HOMA-IR for T2DM were 2.87 for men and 2.36 for women. However, the different diagnostic ranges of HOMA-IR were used to distinguish T2DM according to age and sensitivity progressively decreased with age especially in women. Different MetS components and insulin secretory function in old age should also be considered when adopting HOMA-IR cut-off values for T2DM assessment.

CONFLICTS OF INTEREST: No potential conflict of interest relevant to this article was reported.

Supplementary Table 1

Baseline clinical and demographic characteristics according to diabetes criteria
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Fig. 1

Prevalence of type 2 diabetes mellitus (T2DM) and dysglycemia in different age groups and sex. aP<0.05, bP<0.01.

Fig. 2

Area under the curve (AUC) (95% confidence interval [CI]) for (A) type 2 diabetes mellitus (T2DM) in men, (B) T2DM in women, (C) dysglycemia in men, and (D) dysglycemia in women in different age groups.

Fig. 3

Comparison of homeostasis model assessment of β-cell function (HOMA-β) according to sex and age group (distinguished by 50 years) in (A) low tertile of homeostasis model assessment of insulin resistance (HOMA-IR), (B) mid tertile of HOMA-IR, and (C) high tertile of HOMA-IR among those with dysglycemia. White bar, 50 years old or less; gray bar, more than 50 years old. aP<0.05.

Table 1

Baseline clinical and demographic characteristics

Characteristic Men Women P value
Number 1,851 2,440
Age, yr 50.5±16.5 50.5±15.8 0.992
BMI, kg/m2 24.4±3.3 23.5±3.5 <0.001
SBP, mm Hg 122±16 116±18 <0.001
DBP, mm Hg 78±10 74±10 <0.001
FPG, mg/dL 100±20 95±14 0.462
HbA1c, % 5.6±0.6 5.5±0.5 0.015
T2DM 120 (6.5) 95 (3.9) <0.001
TG, mg/dL 125 (86–188) 96 (66–139) <0.001
HDL-C, mg/dL 46 (39–54) 53 (44–62) <0.001
Current smoker 524 (28.8) 73 (3.0) <0.001
Heavy alcoholics 907 (59.3) 443 (28.1) <0.001
Regular aerobic exercise 944 (52.6) 1,061 (44.3) <0.001
Educational state, ≤HS 928 (51.5) 1,492 (62.3) <0.001
Fasting insulin, µIU/mL 6.45 (4.30–9.70) 6.30 (4.40–9.30) 0.495
HOMA-IR 1.56 (0.99–2.41) 1.44 (0.97–2.22) 0.003
HOMA-β 68.8 (45.9–102.2) 76.5 (54.0–108.0) <0.001
Metabolic syndrome
 Abdominal obesity 587 (31.7) 683 (28.0) 0.008
 TG 689 (37.2) 516 (21.1) <0.001
 HDL-C 482 (26.0) 977 (40.0) <0.001
 Blood pressure 868 (46.9) 844 (34.6) <0.001

Values are presented as mean±standard deviation, number (%), or median (interquartile range).

BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure; FPG, fasting plasma glucose; HbA1c, glycosylated hemoglobin; T2DM, type 2 diabetes mellitus; TG, triglyceride; HDL-C, high density lipoprotein cholesterol; HS, high school; HOMA-IR, homeostasis model assessment of insulin resistance; HOMA-β, homeostasis model assessment of β-cell function.

Table 2

Multivariate OR (95% CI) of T2DM/dysglycemia according to metabolic syndrome components

Variable Men Women
OR (95% CI) P value Multivariate OR (95% CI)a P value OR (95% CI) P value Multivariate OR (95% CI)a P value
 WC criteria 0.90 (0.58–1.41) 0.658 0.74 (0.45–1.24) 0.254 4.97 (3.24–7.64) <0.001 1.58 (0.85–3.37) 0.240
 TG criteria 2.04 (1.33–3.14) 0.001 2.14 (1.31–3.50) 0.003 1.51 (0.95–2.41) 0.084 1.18 (0.58–2.38) 0.649
 HDL criteria 0.77 (0.49–1.20) 0.248 0.85 (0.51–1.42) 0.541 1.61 (0.99–2.63) 0.056 2.40 (1.13–5.07) 0.022
 BP criteria 0.99 (0.64–1.53) 0.952 1.10 (0.67–1.80) 0.702 1.48 (0.88–2.48) 0.139 1.57 (0.72–3.44) 0.260
 WC criteria 1.12 (0.74–1.68) 0.601 1.44 (1.09–1.90) 0.009 3.83 (3.18–4.61) <0.001 1.26 (0.92–1.72) 0.159
 TG criteria 1.93 (1.28–2.90) 0.002 1.61 (1.24–2.08) <0.001 1.62 (1.03–2.55) 0.037 1.25 (0.89–1.74) 0.196
 HDL criteria 0.81 (0.53–1.23) 0.320 0.81 (0.60–1.08) 0.144 1.56 (0.97–2.52) 0.068 1.22 (0.92–1.62) 0.160
 BP criteria 1.06 (0.70–1.62) 0.782 1.07 (0.83–1.38) 0.611 1.56 (0.94–2.59) 0.084 1.01 (0.73–1.37) 0.957

OR, odds ratio; CI, confidence interval; T2DM, type 2 diabetes mellitus; WC, waist circumference; TG, triglyceride; HDL, high density lipoprotein; BP, blood pressure.

aAll values were adjusted for age, homeostasis model assessment of insulin resistance, metabolic syndrome components and lifestyle factors (regular aerobic exercise, education, smoking status, and heavy drinking).

Table 3

Assessment of dysglycemia and T2DM based on AUC and optimal cut-off points for HOMA-IR

Men Women
AUC (95% CI) Cut-off Sensitivity, % Specificity, % PPV, % NPV, % AUC (95% CI) Cut-off Sensitivity, % Specificity, % PPV, % NPV, %
Dysglycemia 0.685 (0.671–0.719) 1.6 64.3 64.5 65.0 63.6 0.728 (0.708–0.748) 1.6 63.3 70.0 58.6 73.5
T2DM 0.774 (0.730–0.818) 2.9 56.7 85.4 21.2 96.6 0.837 (0.794–0.879) 2.4 72.6 79.9 12.8 98.6

T2DM, type 2 diabetes mellitus; AUC, area under the curve; HOMA-IR, homeostasis model assessment of insulin resistance; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value.

Table 4

Association between metabolic syndrome components and the cut-off point of HOMA-IR (1.6) for dysglycemia

OR (95% CI)a
Men Women
TG criteria 2.61 (2.09–3.26) 4.03 (3.05–5.33)
HDL criteria 2.75 (2.13–3.55) 3.08 (2.46–3.84)
BP criteria 2.63 (2.08–3.32) 2.03 (1.56–2.64)
WC criteria 7.61 (5.85–9.90) 5.62 (4.31–7.34)

HOMA-IR, homeostasis model assessment of insulin resistance; OR, odds ratio; CI, confidence interval; TG, triglyceride; HDL, high density lipoprotein; BP, blood pressure; WC, waist circumference

aAdjusting for age and lifestyle factors (alcohol intake, education, and exercise).

Table 5

Sex distribution of HOMA-IR cut-off levels based on sensitivity and specificity for T2DM in different age groups

Age, yr Incidence AUC (95% CI) P valuea ROC coefficientsb Youden index criteria
Sensitivity, % Specificity, %
 20–30s 9 (1.7) 0.804 (0.646–0.962) .020 −0.035 66.7 82.7
 40s 20 (5.9) 0.842 (0.764–0.919) 70.0 81.8
 50s 33 (8.2) 0.869 (0.814–0.925) 72.7 87.3
 60s 37 (11.1) 0.704 (0.614–0.794) 40.5 81.2
 70s 21 (8.1) 0.736 (0.628–0.844) 42.9 90.3
 20–30s 11 (1.7) 0.991 (0.982–1.000) <0.001 −0.092c 100 82.3
 40s 12 (2.5) 0.946 (0.898–0.993) 91.7 86.1
 50s 19 (3.4) 0.839 (0.748–0.930) 73.7 81.9
 60s 25 (6.2) 0.760 (0.648–0.872) 68.0 76.6
 70s 28 (8.3) 0.736 (0.656–0.816) 57.1 70.8

Values are presented as number (%).

HOMA-IR, homeostasis model assessment of insulin resistance; T2DM, type 2 diabetes mellitus; AUC, area under the curve; CI, confidence interval; ROC, receiver-operating characteristic operation.

aP value for difference of AUC values between age group, bP value for linear trend of AUC values by age group, cP<0.05.

Figure & Data



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      Insulin Resistance and the Risk of Diabetes and Dysglycemia in Korean General Adult Population
      Diabetes Metab J. 2018;42(4):296-307.   Published online April 24, 2018
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