Table 1 General characteristics of study participants by UIC categories
Urinary iodine | Adequate | Low | More than adequate | Excessive | P |
|---|---|---|---|---|---|
Age, yr | 67 (61–72) | 68 (63–73) | 66 (61–71) | 66 (60–71) | < 0.01 |
Women, % | 50.1 | 57.9 | 55.2 | 52.3 | < 0.01 |
UIC, μg/L | 136.9 (118.1–164.4) | 72.3 (57.3–85.2) | 234.8 (214.9–262.1) | 392.8 (335.0–604.6) | < 0.01 |
FPG, mmol/L | 7.2 (6.1–8.6) | 7.2 (6.2–8.5) | 7.4 (6.4–9.0) | 7.1 (6.1–8.5) | 0.08 |
HbA1c, % | 7.2 (6.5–8.1) | 7.1 (6.5–8.1) | 7.3 (6.6–8.2) | 7.1 (6.5–8.0) | 0.06 |
BMI, kg/m2 | 24.6 (22.6–27.1) | 24.4 (22.4–26.9) | 25.1 (22.8–27.8) | 25.2 (23.0–27.5) | < 0.01 |
Duration of diabetes, yr | 8 (3–15) | 10 (4–16) | 7 (3–15) | 9 (3–15) | < 0.01 |
Current smokers, % | 19.4 | 15.7 | 19.0 | 20.4 | 0.01 |
Beyond high school education, % | 51.0 | 50.8 | 51.4 | 50.5 | 0.994 |
TSH, mIU/L | 2.54 (1.75–3.56) | 2.61 (1.84–3.73) | 2.36 (1.65–3.45) | 2.62 (1.74–3.74) | 0.015 |
FT4, pmol/L | 16.57 (15.25–18.13) | 16.71 (15.25–18.21) | 16.75 (15.26–18.48) | 16.36 (15.02–17.92) | 0.129 |
Blood lipids | |||||
 Total cholesterol, mmol/L | 5.07 (4.29–5.85) | 5.03 (4.26–5.86) | 5.19 (4.36–5.93) | 4.98 (4.12–5.82) | 0.22 |
 LDL-C, mmol/L | 3.15 (2.55–3.72) | 3.10 (2.54–3.69) | 3.23 (2.62–3.76) | 3.04 (2.50–3.61) | 0.12 |
 HDL-C, mmol/L | 1.16 (0.98–1.36) | 1.18 (1.02–1.39) | 1.18 (1.02–1.38) | 1.15 (0.98–1.34) | < 0.01 |
 Triglycerides, mmol/L | 1.51 (1.08–2.17) | 1.53 (1.10–2.19) | 1.58 (1.15–2.17) | 1.58 (1.08–2.36) | 0.33 |