Table 1 Subject characteristics (unweighted N = 1,560; weighted N = 155,402,992).

From: Low total and free triiodothyronine levels are associated with insulin resistance in non-diabetic individuals

Characteristics Total (N = 1560)
HOMA-IR 2.71 ± 0.08
Demographic data
Age
   20–40 years 667 (47.3)
   41–60 years 529 (38.7)
   ≥61 years 364 (14.0)
Sex
   Female 764 (48.9)
   Male 796 (51.1)
Race
   Non-Hispanic white 723 (68.9)
   Non-Hispanic black 288 (10.7)
   Mexican American 283 (8.6)
   Other Hispanic 195 (5.2)
   Other race 71 (6.6)
Comorbidities
Liver function
   Normal 1389 (89.7)
   Poor 170 (10.3)
Chronic kidney disease
   No, eGFR ≥60 (mL/min/1.73 m2) 1462 (94.9)
   Yes, eGFR <60 (mL/min/1.73 m2) 98 (5.1)
Cardiovascular disease
   No 1446 (94.9)
   Yes 114 (5.1)
Depression
   No 1355 (89.2)
   Yes 111 (5.5)
Obesity
   No 1067 (71.4)
   Yes 475 (27.7)
Hypertension
   No 1137 (75.0)
   Yes 421 (24.9)
Dyslipidemia
   No 619 (39.8)
   Yes 940 (60.0)
Health behavior
Smoking
   Never 857 (56.0)
   Former 353 (22.1)
   Current 349 (21.9)
Alcohol consumption
   Never 176 (9.3)
   Former drinker 207 (11.9)
   Current drinker 944 (66.0)
Physical activity
   Metabolic equivalent of task ≥600 1010 (69.6)
   Metabolic equivalent of task <600 548 (30.4)
Vigorous recreational activity
   No 1169 (69.2)
   Yes 391 (30.8)
Moderate recreational activity
   No 965 (57.1)
   Yes 595 (42.9)
Laboratory studies
Two Hour Glucose (mmol/L) 6.17 ± 0.08
Glycohemoglobin (%)
   <5.5 847 (61.6)
   5.5–6.4 695 (37.9)
   ≥6.5 15 (0.3)
High-density lipoprotein (mmol/L) 1.39 ± 0.02
Triglyceride (mmol/L) 1.45 ± 0.03
Serum vitamin D
   Normal (>75 nmol/L) 298 (24.7)
   Insufficiency (50–75 nmol/L) 559 (37.4)
   Deficiency (<50 nmol/L) 518 (25.8)
C-reactive protein (mg/dL) 0.31 ± 0.01
  1. eGFR, estimated glomerular filtration rate.
  2. Continuous variables were shown mean ± standard error; categorical variables were shown unweighted counts (weighted %). Numbers may not add to full sample due to missing data.