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Table 1 General characteristics of study participants by UIC categories

From: Iodine nutrition status and its association with microvascular complications in urban dwellers with type 2 diabetes

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
  1. Data are summarized as median (interquartile range) for continuous variables or as number with proportion for categorical variables
  2. UIC Urinary iodine concentration, FPG Fasting plasma glucose, HbA1c Glycated hemoglobin, BMI Body mass index, LDL-C Low density lipoprotein cholesterol, HDL-C High density lipoprotein cholesterol, TSH Thyroid-stimulating hormone, FT4 Free thyroxine
  3. Urinary iodine concentrations: low, < 100 μg/L; adequate, 100 to < 200 μg/L; more than adequate, 200 to < 300 μg/L; excessive, ≥300 μg/L