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Original Article
 Association between a family history of diabetes and carotid artery atherosclerosis in Korean adults
Sun Young Shim1,2orcid, Ga Bin Lee1,2orcid, Jee-Seon Shim2,3orcid, Sun Jae Jung1,3orcid, Hyeon Chang Kim1,2,3orcid
Epidemiol Health 2021;43:e2021049.
DOI: https://doi.org/10.4178/epih.e2021049
Published online: August 3, 2021
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1Department of Public Health, Graduate School, Yonsei University, Seoul, Korea

2Cardiovascular and Metabolic Diseases Etiology Research Center, Yonsei University College of Medicine, Seoul, Korea

3Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea

Correspondence: Hyeon Chang Kim Department of Preventive Medicine, Yonsei University College of Medicine, 50-1 Yonse-ro, Seodaemun-gu, Seoul 03722, Korea E-mail: hckim@yuhs.ac
• Received: April 28, 2021   • Accepted: August 3, 2021

©2021, Korean Society of Epidemiology

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • OBJECTIVES
    Diabetes is a well-known risk factor for atherosclerosis, but the association between a family history of diabetes and atherosclerosis remains unknown. In this study, we assessed the association between a family history of diabetes and increased carotid intima-media thickness (IMT), a marker of subclinical atherosclerosis, in a middle-aged Korean population.
  • METHODS
    This cross-sectional study included 3,974 community-dwelling adults (1,404 male and 2,570 female) aged 30-64 years from the Cardiovascular and Metabolic Diseases Etiology Research Center cohort. The presence of a family history of diabetes was assessed through face-to-face interviews using a standardized questionnaire. Carotid IMT was assessed using B-mode ultrasonography, and increased IMT was defined as a value in the top quartile of the IMT values of all participants. Multivariate logistic regression was used to evaluate independent associations between a family history of diabetes and increased IMT.
  • RESULTS
    A family history of diabetes was significantly associated with increased carotid IMT (odds ratio, 1.23; 95% confidence interval, 1.03 to 1.48) after adjusting for sex; age; body mass index; systolic blood pressure; total cholesterol, triglyceride, and hemoglobin A1c levels; smoking; alcohol consumption; exercise; use of antidiabetic, antihypertensive, and antilipidemic drugs; and a family history of hypertension. The positive association remained significant after excluding participants with diabetes (odds ratio, 1.21; 95% confidence interval, 1.00 to 1.47).
  • CONCLUSIONS
    A family history of diabetes was positively associated with increased carotid IMT, even in participants without diabetes. Therefore, information on a family history of diabetes may help identify individuals at high risk of atherosclerotic cardiovascular disease.
  • Keywords: Diabetes mellitus; Atherosclerosis; Carotid intima-media thickness; Medical history taking
Approximately 415 million people worldwide have diabetes mellitus, and an estimated 193 million people have undiagnosed diabetes [1]. Diabetes is a primary risk factor for atherosclerosis [2,3], stroke [4], coronary heart disease [5], and dyslipidemia [6]. People with diabetes have a higher prevalence and/or greater severity of atherosclerosis than those without diabetes [7]. This predisposition to severe atherosclerosis considerably contributes to increased morbidity and mortality from coronary artery disease in patients with diabetes [7]. The link between diabetes and the risk of atherosclerotic cardiovascular disease has been widely reported in the literature [2,7-10]. However, only a few studies have assessed the association between a family history of diabetes and atherosclerosis.
Individuals with a family history of diabetes have a higher risk of diabetes than persons without a family history of diabetes [11]. A family history of diabetes has also been associated with cardiometabolic disorders that can trigger and modify the atherosclerotic process [12]. However, inconsistent results have been reported regarding whether a family history of diabetes is related to atherosclerosis independent of other risk factors [13-15]. Some studies have shown that a family history of type 2 diabetes mellitus is significantly associated with the risk of atherosclerosis among individuals without diabetes [15,16], whereas other works have not identified such a link [13,17].
Clarifying these inconclusive results is important because information on a family history of diabetes might be a useful tool to identify individuals at risk of atherosclerotic cardiovascular disease [18,19]. Therefore, this study aimed to assess the association between a family history of diabetes and increased intima-media thickness (IMT) of the carotid arteries, a marker of general subclinical atherosclerosis, in a middle-aged Korean population. We hypothesized that participants with a family history of diabetes would be more likely to have increased carotid IMT than those without a family history of diabetes.
Study population
This cross-sectional study analyzed baseline data from a research clinic at the Cardiovascular and Metabolic Diseases Etiology Research Center (CMERC). We excluded 36 people who answered that they were uncertain whether either of their parents had diabetes, and 50 participants without IMT measurements or covariates. In total, 3,974 community-dwelling adults (1,404 male and 2,570 female) aged 30-64 years, without myocardial infarction, stroke, or heart failure, completed a questionnaire survey and underwent regular health examinations [20].
Measurements
A family history of diabetes was assessed through face-to-face interviews using standardized questionnaires following the pre-established CMERC protocol [21]. Participants had to report whether a family member (father, mother, or sibling) had been diagnosed with or died from a specific disease [21]. The primary analysis was conducted only on the participants who knew whether their parents had diabetes. A family history of diabetes was defined as having a father or mother who had been diagnosed with or died from diabetes. We additionally included data from participants who were unsure whether they had a family history of diabetes in a sensitivity analysis. In this analysis, parents who were uncertain of whether they had diabetes were considered not to have diabetes. Participants with diabetes were defined as individuals with a previous diagnosis of diabetes by a medical doctor, a fasting plasma glucose level ≥ 126 mg/dL, or hemoglobin A1c (HbA1c) ≥ 6.5%. Impaired fasting glucose was defined as a fasting plasma glucose level of 100-125 mg/dL.
Carotid arteries were examined using B-mode ultrasonography (Accuvix XG; Samsung Medison, Seoul, Korea), which was performed by trained operators according to a predefined study protocol [21]. Carotid IMT was measured at the 1-cm segment of the common carotid arteries proximal to the carotid bulb region, at the time of the R-wave on the electrocardiogram, and was performed bilaterally using dedicated software [21]. The interrater reliability of IMT measurements was high [22]. Increased IMT was defined as a mean carotid IMT on the left or right sides greater than or equal to the cut-off value (≥ 0.717 mm). The cut-off value was set to the larger of each of the highest quartile values of the mean carotid IMT measured on both sides. Sex-specific cut-off levels were used for a sex-stratified analysis (male: ≥ 0.726 mm, female: ≥ 0.710 mm).
As for the covariates, physical activity was assessed using the International Physical Activity Questionnaire-Short Form [23,24], and regular exercise was defined as moderate or high-intensity physical activity more than twice a week [25]. Participants were classified by smoking and alcohol intake status as current smokers and former/never smokers, and current drinkers and former/never drinkers, respectively. Medication status was assessed using a questionnaire and divided into currently taking drugs and not taking drugs. A family history of hypertension was defined as having a parent with a hypertension diagnosis or who died from hypertension-related causes.
Body weight was measured to the nearest 0.1 kg using a digital scale (DB-150; CAS, Seoul, Korea), and standing height was measured to the nearest 0.1 cm using a stadiometer (DS-102; JENIX, Seoul, Korea). Body mass index (BMI) was calculated as the body weight divided by height squared (kg/m2) and classified into the following groups: < 23 kg/m2, 23 kg/m2 to < 25 kg/m2, 25 kg/m2 to < 30 kg/m2, and ≥ 30 kg/m2 [26]. Blood pressure was measured with the participants in a sitting position and after they had rested for at least 5 minutes using an automated oscillometric device (HEM-7080; Omron Healthcare, Kyoto, Japan). Systolic and diastolic blood pressure measurements were made 3 times each at 2-minute intervals in the right arm [21], and the mean of the last 2 measurements was used in the analysis. Overnight fasting blood samples were collected from all participants by a trained researcher from the antecubital vein. Detailed information about the measurements in the CMERC study has been published elsewhere [21].
Statistical analysis
We evaluated the differences in variables according to a family history of diabetes using the 2-sample t-test or Mann-Whitney U test for continuous variables and the chi-square test for categorical variables. The association between a family history of diabetes and increased carotid IMT was analyzed using multivariate logistic regression models adjusted for sex; age; BMI; systolic blood pressure; total cholesterol, triglyceride, and HbA1c levels; smoking and drinking status; regular exercise; use of antihypertensive, lipidlowering, and antidiabetic drugs; and a family history of hypertension. These analyses were performed on 3,974 participants and repeated on 3,691 participants after excluding 283 people with diabetes, and on 3,244 participants after additionally excluding 447 people with impaired fasting glucose. The same multivariate logistic regression model was used to examine the association between a family history of diabetes, including those with an unknown family history, and increased carotid IMT. Lastly, the associations in subgroups defined according to sex, age, BMI, smoking status, hypertension, or dyslipidemia were investigated. The putative interactions within each subgroup were included in the model and tested. Effect sizes were reported using odds ratios (ORs) with 95% confidence intervals (CIs) and p-values. All statistical tests were performed using SAS version 9.4 (SAS Institute Inc., Cary, NC, USA).
Ethics statement
The study protocol was approved by the Institutional Review Board (IRB) of Severance Hospital at Yonsei University College of Medicine (IRB No. 4-2013-0661). Informed consent was confirmed by the IRB. All procedures in this work complied with the ethical standards of the relevant national and institutional committees on human experimentation and the Helsinki Declaration of 1975, as revised in 2008.
General characteristics
Table 1 summarizes the characteristics of the study participants based on the presence of a family history of diabetes. The sex-stratified data are provided in Supplementary Material 1. Of the 3,974 individuals, 903 (22.7%) had a family history of diabetes. These participants had higher BMI, fasting glucose, and HbA1c levels, but lower high-density lipoprotein cholesterol levels, than participants without a family history of diabetes. There was no difference in the mean carotid IMT between people with a family history of diabetes and those without (0.679 mm and 0.675 mm, respectively; p=0.378) because a family history of diabetes was more frequently reported among younger participants. The ageadjusted carotid IMT was significantly higher in participants with a family history of diabetes than those without (0.685 mm and 0.676 mm, respectively; p=0.021). A family history of hypertension and myocardial infarction, antidiabetic medication, and diagnosis of diabetes were more frequent among people with a family history of diabetes. This result was also founded in the sex-stratified analysis (Supplementary Material 1).
Association between a family history of diabetes and carotid atherosclerosis
In all participants, a family history of diabetes was positively and independently associated with increased IMT (OR, 1.23; 95% CI, 1.03 to 1.48; p=0.023), after adjusting for sex; age; BMI; systolic blood pressure; total cholesterol, triglyceride, and HbA1c levels; smoking and drinking status; regular exercise; use of antihypertensive, lipid-lowering, and antidiabetic drugs; and a family history of hypertension (Table 2). The association remained significant even after excluding individuals with diabetes (OR, 1.21; 95% CI, 1.00 to 1.47; p=0.048). A similar association was also observed after additionally excluding people with impaired fasting glucose (OR, 1.21; 95% CI, 0.98 to .48).
Figure 1 shows the association between a family history of diabetes and increased IMT in various subgroups. After adjusting for covariates, the OR for the multivariate logistic regression analysis was 1.28 (p=0.111) in males and 1.33 (p=0.013) in females. A family history of diabetes was positively associated with increased IMT in most subgroups, although the strength of the association varied. The ORs for increased carotid IMT were particularly high for participants with a BMI < 23 kg/m2 (OR, 1.60; 95% CI, 1.18 to 2.18), non-smokers (OR, 1.26; 95% CI, 1.04 to 1.53), those without hypertension (OR, 1.25; 95% CI, 1.01 to 1.55), and those with dyslipidemia (OR, 1.43; 95% CI, 1.07 to 1.91). The strength of the association was significantly different between participants with a BMI ≥ 23 kg/m2 and those with a BMI < 23 kg/m2 (p for interaction= 0.036). No significant differences were observed between the other subgroups.
In a sensitivity analysis that included participants who did not know whether either of their parents had diabetes, the association between a family history of diabetes and increased IMT persisted for all participants (OR, 1.25; 95% CI, 1.05 to 1.50) and for the participants without diabetes (OR 1.24; 95% CI 1.03 to 1.50) (Table 3).
We found a significant positive association between a family history of diabetes and increased carotid IMT in participants with and without diabetes while controlling for potential confounders.
Only a few studies have demonstrated this association. An analysis of 620 individuals without diabetes from 24 Mexican-American families reported a significant association between a family history of type 2 diabetes and increased common carotid artery IMT [14]. A cross-sectional study of 401 people with normal glucose tolerance reported a significant association between a family history of type 2 diabetes and increased IMT [15]. In a case-control study, the first-degree offspring of patients with type 2 diabetes had reduced total insulin sensitivity and impaired beta-cell function, both of which were related to increased internal carotid artery IMT, compared to individuals without a family history of diabetes [16]. However, conflicting results have also been reported in the literature. A cross-sectional study showed that carotid IMT was higher in a subgroup of participants with high low-density lipoprotein cholesterol (LDL-C) and a family history of cardiovascular disease than in individuals without diabetes who had a family history of diabetes [13]. Another study involving 6,434 participants who had undergone health examinations showed that a family history of diabetes was not significantly associated with the development of subclinical atherosclerosis in participants without diabetes after adjusting for clinical variables. However, the association was significant in individuals with diabetes [17]. This study suggests that the combination of chronic hyperglycemia and a family history of diabetes might be critical in the development of atherosclerosis.
Given that people with a family history of diabetes often do not receive screening for diabetes or risk factors, it is important to understand how a family history of diabetes contributes to the development of cardiovascular disease [27]. A previous report showed that participants without diabetes, but with a family history of diabetes, had a higher risk of glucose intolerance [28] and lower insulin sensitivity [13]. Hyperglycemia causes non-enzymatic glycosylation of proteins, leading to the production of advanced glycation products, which can damage the arterial walls and possibly contribute to atherosclerosis [29]. In addition, a family history of diabetes is related to abnormal blood lipid levels [13] and the accumulation of LDL-C in the subendothelial matrix; this pattern may be linked to atherosclerosis, since elevated LDL-C levels are characteristic of early atherosclerosis [29]. Thus, impaired glucose and lipid metabolism may lead to atherosclerosis in individuals with a family history of diabetes. However, alternative explanations are indispensable because the independent association between a family history of diabetes and increased IMT persisted after adjusting for HbA1c, total cholesterol, and triglyceride levels. This independent association could be related to endothelial dysfunction [30], impaired fibrinolysis [31], as yet unidentified genetic factors, inflammatory processes [14], or interactions or mediating effects not considered in our analysis. A previous study suggested that elevated fasting and postprandial glucose concentrations in the offspring of patients with type 2 diabetes could lead to the loss of endothelial function, resulting in increased IMT [15]. Another explanation is that pre-existing inflammation before impaired glucose metabolism triggers arteriosclerosis [14].
This study has some limitations. First, it may have been affected by recall bias, as participants self-reported their family history of diabetes. However, in a validation study comparing parental history reported by the offspring with parents’ confirmed medical history, positive and negative reports of a parental history of diabetes were found to be reliable [32]. Nevertheless, misclassification cannot be ruled out because there are no available data on the validity of the family history questionnaire in our cohort. The second limitation concerns operator dependency, which is a well-known problem in ultrasonographic measurements. Since carotid IMT was calculated by assessing the carotid arteries using B-mode ultrasonography, there may have been inconsistencies between operators and devices [33]. Although we followed a consistent protocol for our measurements and used an identical instrument at a single health center, variance in measurements between technicians could not be completely excluded. Third, our analysis did not include data from oral glucose tolerance tests to define impaired glucose tolerance. Impaired glucose tolerance and impaired fasting glucose differ in terms of the insulin resistance site [34]. However, both pre-diabetic conditions reflect intermediate states of abnormal glucose control that exist between diabetes and normal glucose homeostasis [34]. Fourth, although we included well-known risk factors for atherosclerosis in the adjusted models, there may have been residual confounding that we did not control for. Lastly, the individuals in this cohort were not randomly selected and they did not represent the entire Korean population. Thus, the findings of our study may not be generalizable to other populations.
In conclusion, there was a positive association between a family history of diabetes and increased carotid IMT. This association was significant even in individuals without diabetes. Our findings suggest that checking for a family history of diabetes may help identify individuals at high risk of atherosclerotic cardiovascular disease. To deepen our understanding of these results, further studies involving a large number of participants, hereditary research, prospective cohorts, and meta-analyses are needed.
Supplementary materials are available at https://www.e-epih.org/.

Supplementary Material 1.

General characteristics of study participants by sex
epih-43-e2021049-suppl.docx

CONFLICT OF INTEREST

The authors have no conflicts of interest to declare for this study.

FUNDING

This research was supported by the Basic Research Program through the National Research Foundation of Korea (NRF) funded by the MSIT (grant No. 2019R1A4A1028155).

AUTHOR CONTRIBUTIONS

Conceptualization: HCK, SYS. Data curation: HCK, SYS, GBL, JSS, SJJ. Formal analysis: HCK, SYS, GBL, JSS, SJJ. Funding acquisition: HCK, SJJ. Writing – original draft: HCK, SYS. Writing –review & editing: HCK, SYS, GBL, JSS, SJJ.

The authors appreciate all cohort members who participated voluntarily in the CMERC study. We are also grateful to the members of the research staff for their effort and passion.
Figure 1.
Associations between a family history of diabetes and increased carotid intima-media thickness in different subgroups. OR, odds ratio; CI, confidence interval. 1Adjusted for all other factors not involving the subgroup, including sex, age, body mass index, systolic blood pressure, total cholesterol, triglyceride, hemoglobin A1c, smoking status, drinking status, regular exercise, antihypertensives, lipid-lowering drug, antidiabetics and family history of hypertension.
epih-43-e2021049f1.jpg
Table 1.
General characteristics of the study participants according to the presence of a family history of diabetes
Characteristics Family history of diabetes
 p-value
No (n=3,071) Yes (n=903)
Age (yr) 51.8±9.3 49.6±9.2 <0.001
Female 1,997 (65.0) 573 (63.5) 0.407
Body mass index (kg/m2) 23.8±3.0 24.2±3.1 0.002
Systolic blood pressure (mmHg) 118.6±15.1 118.3±14.2 0.570
Diastolic blood pressure (mmHg) 76.1±10.0 76.3±9.6 0.592
Total cholesterol (mg/dL) 198.6±34.8 198.6±37.5 0.957
HDL cholesterol (mg/dL) 57.9±14.7 56.6±14.8 0.018
LDL cholesterol (mg/dL) 118.7±31.8 119.1±33.7 0.759
Triglyceride (mg/dL) 106 [76-150] 109 [79-160] 0.049
Fasting glucose (mg/dL) 88 [82-95] 90 [83-98] <0.001
Hemoglobin A1c (%) 5.64±0.65 5.78±0.82 <0.001
Hypertension 806 (26.3) 211 (23.4) 0.089
Dyslipidemia 942 (30.7) 316 (35.0) 0.016
Diabetes 184 (6.0) 99 (11.0) <0.001
Family history of hypertension 984 (32.0) 501 (55.5) <0.001
Family history of cardio-cerebrovascular disease
 Stroke 456 (14.9) 133 (14.7) 0.969
 Myocardial infarction 174 (5.7) 93 (10.3) <0.001
Medication uses
 Antihypertensives 485 (15.8) 120 (13.3) 0.074
 Lipid-lowering drugs 349 (11.4) 108 (12.0) 0.664
 Antidiabetics 110 (3.6) 74 (8.2) <0.001
Health behaviors
 Current smoker 420 (13.7) 131 (14.5) 0.562
 Current drinker 2,233 (72.7) 686 (76.0) 0.057
 Regular exercise 1,088 (35.4) 334 (37.0) 0.412
Carotid IMT (mm)1 0.679±0.123 0.675±0.120 0.378
Age-adjusted carotid IMT (mm) 0.676 ±0.002 0.685±0.004 0.021

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

HDL, high-density lipoprotein; LDL, low-density lipoprotein; IMT, intima-media thickness.

1 The larger of the right mean carotid IMT and left mean carotid IMT was determined as the carotid IMT.

Table 2.
Factors associated with increased carotid IMT
Variables All participants (n=3,974)
 Participants without diabetes (n=3,691)
 Participants without diabetes or impaired fasting glucose (n=3,244)
No. of people People with an increased IMT, n (%) OR (95% CI) No. of people People with an increased IMT, n (%) OR (95% CI) No. of people People with an increased IMT, n (%) OR (95% CI)
FH of diabetes
  No 3,071 1,070 (34.8) 1.00 (reference) 2,887 974 (33.7) 1.00 (reference) 2,553 817 (32.0) 1.00 (reference)
Yes 903 315 (34.9) 1.23 (1.03, 1.48) 804 264 (32.8) 1.21 (1.00, 1.47) 691 210 (30.4) 1.21 (0.98, 1.48)
Sex
Female 2,570 857 (33.4) 1.00 (reference) 2,434 792 (32.5) 1.00 (reference) 2,224 691 (31.1) 1.00 (reference)
Male 1,404 528 (37.6) 1.08 (0.90, 1.30) 1,257 446 (35.5) 1.03 (0.85, 1.25) 1,020 336 (32.9) 0.97 (0.78, 1.20)
Age (per 10 yr) - - 2.81 (2.52, 3.13) - - 2.81 (2.51, 3.15) - - 2.96 (2.61, 3.35)
BMI (kg/m2)
<23 1,656 433 (26.2) 1.00 (reference) 1,604 406 (25.3) 1.00 (reference) 1,490 362 (24.3) 1.00 (reference)
23-<25 1,007 364 (36.2) 1.26 (1.05, 1.52) 938 330 (35.2) 1.27 (1.05, 1.54) 823 286 (34.8) 1.35 (1.10, 1.66)
25-<30 1,172 524 (44.7) 1.79 (1.49, 2.16) 1,038 452 (43.6) 1.82 (1.49, 2.21) 846 343 (40.5) 1.75 (1.42, 2.17)
≥30 139 64 (46.0) 2.12 (1.41, 3.19) 111 50 (45.1) 2.28 (1.44, 3.59) 85 36 (42.4) 2.06 (1.23, 3.46)
SBP (per 10 mmHg) - - 1.19 (1.13, 1.25) - - 1.18 (1.12, 1.25) - - 1.19 (1.12, 1.26)
Total cholesterol (per 10 mg/dL) - - 1.02 (1.00, 1.04) - - 1.02 (1.00, 1.04) - - 1.02 (0.99, 1.04)
Triglyceride (per 10 mg/dL) - - 1.00 (0.99, 1.01) - - 1.00 (0.99, 1.01) - - 1.01 (0.99, 1.02)
Hemoglobin A1c (per 1.0%) - - 1.23 (1.09, 1.39) - - 1.42 (1.14, 1.76) - - 1.17 (0.88, 1.57)
Smoking status
Non/former 3,423 1,213 (35.4) 1.00 (reference) 3,195 1,093 (34.2) 1.00 (reference) 2,825 918 (32.5) 1.00 (reference)
Current 551 172 (31.2) 1.22 (0.95, 1.56) 496 145 (29.2) 1.26 (0.97, 1.64) 419 109 (26.0) 1.22 (0.91, 1.63)
Drinking status
Non/former 1,055 412 (39.1) 1.00 (reference) 976 374 (38.3) 1.00 (reference) 880 331 (37.6) 1.00 (reference)
Current 2,919 973 (33.3) 0.84 (0.71, 0.99) 2,715 864 (31.8) 0.82 (0.69, 0.98) 2,364 696 (29.4) 0.80 (0.67, 0.96)
Regular exercise
No 2,552 857 (33.6) 1.00 (reference) 2,368 766 (32.4) 1.00 (reference) 2,093 652 (31.2) 1.00 (reference)
Yes 1,422 528 (37.1) 1.11 (0.95, 1.29) 1,323 472 (35.7) 1.09 (0.93, 1.28) 1,151 375 (32.6) 0.98 (0.83, 1.17)
Antihypertensive use
No 3,369 1,085 (32.2) 1.00 (reference) 3,190 990 (31.0) 1.00 (reference) 2,842 835 (29.4) 1.00 (reference)
Yes 605 300 (49.6) 1.02 (0.83, 1.25) 501 248 (49.5) 1.06 (0.85, 1.33) 402 192 (47.8) 1.02 (0.80, 1.31)
Lipid-lowering drug use
No 3,517 1174 (33.4) 1.00 (reference) 3,330 1,067 (32.0) 1.00 (reference) 2,950 889 (30.1) 1.00 (reference)
Yes 457 211 (46.2) 0.93 (0.74, 1.17) 361 171 (47.4) 1.00 (0.77, 1.29) 294 138 (46.9) 1.06 (0.80, 1.41)
Antidiabetic use
No 3,790 1289 (34.0) 1.00 (reference) - - - - - -
Yes 184 96 (52.2) 0.91 (0.62, 1.34) - - - - - -
FH of hypertension
No 2,489 899 (36.1) 1.00 (reference) 2,297 799 (34.8) 1.00 (reference) 2,005 658 (32.8) 1.00 (reference)
Yes 1,485 486 (32.7) 0.95 (0.81, 1.12) 1,394 439 (31.5) 0.92 (0.78, 1.08) 1,239 369 (29.8) 0.92 (0.77, 1.10)

All variables whose values appear in each column were included in the statistical model for that column.

IMT, intima-media thickness; OR, odds ratio; CI, confidence interval; FH, family history; BMI, body mass index; SBP, systolic blood pressure.

Table 3.
Sensitivity analysis of the association between a family history of diabetes, including those with an unknown family history, and increased carotid IMT
Family history of diabetes1 No. of people People with an increased IMT, n (%) OR (95% CI)2 p-value
All participants
 No 3,094 1,079 (34.9) 1.00 (reference)
 Yes 916 323 (35.3) 1.25 (1.05, 1.50) 0.013
Participants without diabetes
 No 2,906 980 (33.7) 1.00 (reference)
 Yes 811 268 (33.1) 1.24 (1.03, 1.50) 0.027
Participants without diabetes or impaired fasting glucose
 No 2,572 823 (32.0) 1.00 (reference)
 Yes 700 214 (32.6) 1.23 (1.00, 1.51) 0.054
Male
 No 1,079 370 (34.3) 1.00 (reference)
 Yes 330 120 (36.4) 1.29 (0.95, 1.76) 0.099
Female
 No 2,015 717 (35.6) 1.00 (reference)
 Yes 586 212 (36.2) 1.35 (1.08, 1.69) 0.008

IMT, intima-media thickness; OR, odds ratio; CI, confidence interval.

1 Parents who were uncertain whether they had diabetes were considered not to have diabetes.

2 Adjusted for age; sex (except for the males and females groups); body mass index; systolic blood pressure; total cholesterol, triglyceride, and hemoglobin A1c levels; smoking and drinking status; regular exercise; use of antihypertensive, lipid-lowering, and antidiabetic drugs (for all participants, males, and females); and family history of hypertension.

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Figure & Data

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