Table 2.
Demographic characteristics across groups categorised by urinary iodine-to-creatinine ratio (UI/Creat) of 3140 pregnant women with babies alive at one year.
| No. Available | UI/Creat Groups (µg/g) | p Value 2 | ||||
|---|---|---|---|---|---|---|
| <50 | 50–149.9 | 150–249.9 | ≥250 | |||
| Age (years) | 3122 | |||||
| n | 158 | 1764 | 675 | 525 | ||
| Mean (SD) | 27.2 (4.3) | 29.3 (4.5) | 29.9 (4.3) | 29.9 (4.4) | <0.001 | |
| BMI (kg/m2) 1 | 2845 | |||||
| Underweight (<18.5) | 6 (4.2) | 60 (3.7) | 26 (4.2) | 22 (4.6) | <0.001 | |
| Healthy weight (18.5–24.9) | 96 (67.6) | 1180 (73.5) | 482 (77.6) | 371 (77.9) | ||
| Overweight (25–29.9) | 25 (17.6) | 278 (17.3) | 89 (14.3) | 68 (14.3) | ||
| Obese (≥30) | 15 (10.6) | 88 (5.5) | 24 (3.9) | 15 (3.2) | ||
| Parity 1 | 3017 | |||||
| 0 | 96 (62.7) | 813 (47.7) | 285 (43.6) | 234 (46.2) | 0.007 | |
| 1 | 38 (24.8) | 591 (34.7) | 230 (35.2) | 172 (33.9) | ||
| 2 | 17 (11.1) | 227 (13.3) | 105 (16.1) | 77 (15.2) | ||
| 3+ | 2 (1.3) | 72 (4.2) | 34 (5.2) | 24 (4.7) | ||
| Cigarette-smoking 1 | 3067 | 75 (49.0) | 720 (41.7) | 287 (43.0) | 212 (40.8) | 0.30 |
| History of miscarriage 1 | 3022 | 21 (13.8) | 332 (19.4) | 140 (21.5) | 105 (20.6) | 0.18 |
| Child sex 1 | 3140 | |||||
| Male | 67 (41.6) | 880 (49.6) | 354 (52.1) | 249 (47.3) | 0.08 | |
| Trimester of urine collection 1 | 3140 | |||||
| 1st (≤12 weeks) | 122 (75.8) | 1114 (62.8) | 331 (48.7) | 168 (31.9) | ||
| 2nd (13–27 weeks) | 37 (23.0) | 628 (35.4) | 325 (47.8) | 337 (64.1) | <0.001 | |
| 3rd (≥28 weeks) | 2 (1.2) | 31 (1.7) | 24 (3.5) | 21 (4.0) | ||
1 Values are n (%). 2 p value from chi-squared test for categorical data and analysis of variance (ANOVA) for continuous data.