Maternal characteristics associated with deliveries with and without TSH testing during the pregnancy
| Maternal characteristic | Group; no. (%) of deliveries* | OR (95% CI) | |
|---|---|---|---|
| TSH tested n = 111 522 | TSH not tested n = 76 968 | ||
| Age, yr, mean ± SD | 30.2 ± 5.1 | 29.4 ± 5.4 | NA |
| Age ≥ 35 yr | 21 421 (19.2) | 12 843 (16.7) | 1.18 (1.16–1.21) |
| Urban residence† | 79 934 (71.7) | 44 495 (57.8) | 1.85 (1.81–1.88) |
| Nulliparous | 48 069 (43.1) | 28 182 (36.6) | |
| Pre-pregnancy weight, kg‡ | |||
| ≤ 45 | 1031 (0.9) | 608 (0.8) | 1.16 (1.05–1.28) |
| 46–90 | 100 064 (90.2) | 68 486 (89.7) | 1.0 (Ref.) |
| ≥ 91 | 9814 (8.8) | 7215 (9.4) | 0.93 (0.90–0.96) |
| Smoking | 10 621 (9.5) | 9971 (13.0) | 0.69 (0.67–0.71) |
| Heart disease | 591 (0.5) | 332 (0.4) | 1.20 (1.05–1.37) |
| Pre-pregnancy hypertension | 1279 (1.1) | 785 (1.0) | 1.12 (1.03–1.23) |
| Gestational hypertension | 6386 (5.7) | 3669 (4.8) | 1.21 (1.16–1.26) |
| Chronic kidney disease | 116 (0.1) | 63 (0.1) | 1.24 (0.91–1.68) |
| Other medical disorders | 9144 (8.2) | 5015 (6.5) | 1.28 (1.23–1.32) |
Note: CI = confidence interval, NA = not applicable; OR = odds ratio, Ref. = reference category, SD = standard deviation, TSH = thyroid-stimulating hormone.
↵* Except where indicated otherwise. For all characteristics, data were missing for less than 1% of deliveries.
↵† Defined as > 50 000 residents.
↵‡ Denominators used for calculating percentages for this variable were 110 909 and 76 309, respectively.