Table 1 Baseline characteristics of the NHANES (2007–2012) study population in TyG tertiles
From: Exploring the association between triglyceride-glucose index and thyroid function
Characteristics | Overall | Reference range | |
|---|---|---|---|
Male | Female | ||
TyG | 8.43 ± 0.55 |  |  |
Demographics | |||
 Age, years | 41.44 ± 16.81 |  |  |
 Gender (%) |  |  |  |
  Male | 966 (52.57%)a |  |  |
  Female | 882 (47.73%) |  |  |
 Race (%) |  |  |  |
  Mexican American | 292 (15.80%) |  |  |
  Non-Hispanic Black | 354 (19.16%) |  |  |
  Non-Hispanic White | 870 (47.08%) |  |  |
  Other Hispanic | 191 (10.34%) |  |  |
  Other Race | 141 (7.63%) |  |  |
 Marital status (%) |  |  |  |
  Married | 891 (48.21%) |  |  |
  Unmarried | 813 (43.99%) |  |  |
  Unknown | 144 (7.79%) |  |  |
 PIR (%) |  |  |  |
  0–1 | 351 (18.99%) |  |  |
  > 1 | 1360 (73.59%) |  |  |
  Unknown | 137 (7.41%) |  |  |
 Education (%) |  |  |  |
  < High school diploma | 416 (22.51%) |  |  |
  High school diploma | 410 (22.19%) |  |  |
  > High school diploma | 1022 (55.30%) |  |  |
 Alcohol use (%) |  |  |  |
  Never | 162 (8.77%) |  |  |
  Former | 218 (11.80%) |  |  |
  Mild | 548 (29.65%) |  |  |
  Moderate | 277 (14.99%) |  |  |
  Heavy | 416 (22.51%) |  |  |
  Unknown | 227 (12.28%) |  |  |
 Smoke (%) |  |  |  |
  Never | 965 (52.22%) |  |  |
  Former | 347 (18.78%) |  |  |
  Current | 391 (21.16%) |  |  |
  Unknown | 145 (7.85%) |  |  |
 BMI, kg/m2 | 27.07 ± 5.62 |  |  |
 WC, cm | 93.38 ± 14.12 |  |  |
 SBP, mmHg | 117.14 ± 15.49 |  |  |
 DBP, mmHg | 68.44 ± 11.41 |  |  |
 MetS (%) |  |  |  |
  No | 1157 (84.5%) |  |  |
  Yes | 291 (15.75%) |  |  |
 PA level (%) |  |  |  |
  Low | 614 (33.23%) |  |  |
  Intermediate | 618 (33.44%) |  |  |
  High | 616 (33.33%) |  |  |
 Hypertension (%) |  |  |  |
  No | 1396 (75.54%) |  |  |
  Yes | 452 (24.46%) |  |  |
 CVD (%) |  |  |  |
  No | 1620 (87.66%) |  |  |
  Yes | 84 (4.55%) |  |  |
  Unknown | 144 (7.79%) |  |  |
Laboratory indices | |||
 FPG, mmol/L | 5.30 ± 0.43 | 3.33–5.56 | 3.33–5.56 |
 FBI, pmol/L | 64.10 ± 46.98 | 12–150 | 12–150 |
 HbA1c, % | 5.34 ± 0.36 | 4.3–6.0 | 4.3–6.0 |
 ALT, u/L | 25.53 ± 27.39 | 11–47 | 7–30 |
 AST, u/L | 26.03 ± 27.27 | 13–33 | 13–33 |
 Creatinine, umol/L | 75.01 ± 18.06 | 61.88–114.92 | 53.04–97.24 |
 Uric acid, umol/L | 318.17 ± 78.32 | 214.13–499.63 | 172.49–446.10 |
 BUN, mmol/L | 4.28 ± 1.53 | 2.14–8.22 | 2.14–8.22 |
 TC, mg/dL | 192.95 ± 40.06 |  < 200 |  < 200 |
 HDL, mg/dL | 55.25 ± 15.16 |  > 40 |  > 50 |
 LDL, mg/dL | 114.66 ± 34.55 |  < 135 |  < 135 |
 Hemoglobin, g/dL | 14.37 ± 1.51 | 19–65 years: 13.1–17.5  > 65 years: 11.4–17.1 | 19–65 years: 10.6–15.6  > 65 years: 10.9–15.9 |
 Urine iodine (%) |  |  |  |
  < 99 µg/L | 705 (38.15%) |  |  |
  99–199 µg/L | 623 (33.71%) |  |  |
  > 199 µg/L | 520 (28.14%) |  |  |
Thyroid function | |||
 FT3, pg/mL | 3.29 ± 0.62 | 2.5–3.9 | 2.5–3.9 |
 FT4, pmol/L | 10.36 ± 2.15 | 7.74–20.64 | 7.74–20.64 |
 TSH, uiu/mL | 1.20 ± 3.02 | 0.34–5.60 | 0.34–5.60 |
 TFQI | 0.02 ± 0.33 |  |  |
 TSHI | 1.84 ± 0.66 |  |  |
 TT4RI | 19.96 ± 20.88 |  |  |
 FT3/FT4 | 0.51 ± 0.21 |  |  |
 SPINA-GT, pmol/s | 3.74 ± 50.26 |  |  |
 SPINA-GD, nmol/s | 46.72 ± 18.94 |  |  |
 TgAb, iu/mL | 11.47 ± 111.79 | 0–4.0 | 0–4.0 |
 TPOAb, iu/mL | 18.85 ± 87.51 | 0–9.0 | 0–9.0 |
 Thyroid autoimmunity (%) |  |  |  |
  No | 1623 (87.82%) |  |  |
  Yes | 225 (12.18%) |  |  |