Table 2.
Median UIC (µg/L) of US adults by demographic and lifestyle characteristics, NHANES 2011–2012 1.
| Characteristic | mUIC µg/L | (95% CI) | |
|---|---|---|---|
| Overall | 126.6 | (111.9, 141.2) | |
| Sex | Male | 145.6 | (124.1, 167.1) |
| Female | 111.2 * | (96.4, 126.0) | |
| Age | 20–39 years | 120.1 | (98.1, 142.1) |
| 40–59 years | 113.9 * | (94.6, 133.3) | |
| ≥60 years | 157.3 | (133.8, 180.9) | |
| Race | NHW | 120.2 | (98.9, 141.4) |
| NHB | 135.1 | (109.8, 160.4) | |
| NHA | 128.9 | (114.0, 143.8) | |
| Hispanics | 136.1 | (113.9, 158.2) | |
| Education | <High School | 136.4 | (113.4, 159.5) |
| High School | 127.8 | (96.6, 159.1) | |
| >High School | 121.4 | (103.3, 139.5) | |
| PIR 2 | Low | 141.0 | (125.9, 156.1) |
| Medium | 120.4 | (97.7, 143.1) | |
| High | 117.1 * | (97.7, 136.6) | |
| Smoking 3 | Low | 129.9 | (106.7, 153.1) |
| Medium | 130.1 | (108.1, 151.9) | |
| High | 113.8 | (90.9, 136.8) | |
| BMI 4 | Underweight | 118.6 | (71.5, 165.6) |
| Normal | 111.0 * | (95.4, 126.6) | |
| Overweight | 138.8 | (115.5, 162.1) | |
| Obese | 139.2 | (115.3, 163.1) | |
| Supplement 5 | Yes | 148.4 | (124.5, 172.3) |
| No | 121.8 * | (106.7, 136.9) | |
| Alcohol | None | 133.7 | (101.0, 166.5) |
| <0 to 1 drinks/d | 121.3 | (96.3, 146.3) | |
| >1 to 2 drinks/d | 101.0 | (72.1, 129.9) | |
| >2 drinks/d | 140.3 | (121.1, 159.4) | |
| Physical Activity 6 | No Activity | 129.8 | (107.7, 151.6) |
| 0 to <500 | 119.5 | (87.2, 151.8) | |
| 500 to <1000 | 119.1 | (95.3, 142.8) | |
| ≥1000 | 138.7 | (113.3, 163.9) | |
| Waist Circumference | Male | ||
| ≤102 cm | 146.6 | (124.0, 169.2) | |
| >102 cm | 143.6 | (114.0, 173.2) | |
| Female | |||
| ≤88 cm | 104.1 * | (87.3, 120.8) | |
| >88 cm | 116.8 | (97.9, 135.7) |
1 Data are from the National Health and Nutrition Examination Survey; * indicate statistically-significant category within characteristic, p < 0.05. 2 PIR, family poverty-income ratio (low: 0–1.85; medium: 1.85< to 3.5; high: >3.5). 3 Smoking status defined by a serum cotinine concentration (low: <0.015 mg/L; medium: 0.015 to <10 mg/L; high: ≥10 mg/L). 4 BMI: Underweight: <18.5 kg/m2; normal weight: 18.5 to >25 kg/m2; overweight: 25 to <30 kg/m2; and obese: ≥30 kg/m2. 5 Reported taking supplement containing iodine within the past 30 days. 6 Calculated as total MET (metabolic equivalent task minutes)-min/week from self-reported leisure-time physical activities. UIC, urinary iodine concentration; NHW, non-Hispanic white; NHB, non-Hispanic black.