Table 1 Characteristics of infants in the DoD Birth and Infant Health Registry, born 2000-2004 (N = 447 691)
From: Hypothyroidism among military infants born in countries of varied iodine nutrition status
Characteristic | n(%) | |
|---|---|---|
Birth location | Â | Â |
   United States | 419 756 | (93.8) |
   Germany | 13 685 | (3.1) |
   Japan | 10 994 | (2.5) |
   US territory | 3256 | (0.7) |
Sex of infant | Â | Â |
   Male | 229 530 | (51.3) |
   Female | 218 161 | (48.7) |
Infant plurality | Â | Â |
   Singleton | 435 021 | (97.2) |
   Multiple birth | 12 670 | (2.8) |
Estimated gestational age (weeks) | Â | Â |
   Full-term (≥37) | 408 224 | (91.2) |
   Preterm (<37) | 39 467 | (8.8) |
Maternal age (years) | Â | Â |
   ≤19 | 27 951 | (6.2) |
   20-24 | 164 066 | (36.6) |
   25-29 | 129 000 | (28.8) |
   30-34 | 85 433 | (19.1) |
   35-39 | 34 742 | (7.8) |
   ≥40 | 6499 | (1.5) |
Maternal military status | Â | Â |
   Civilian | 365 953 | (81.7) |
   Military | 81 738 | (18.3) |
Military sponsor race/ethnicity | Â | Â |
   White, non-Hispanic | 287 834 | (64.3) |
   Black, non-Hispanic | 76 529 | (17.1) |
   Hispanic | 42 382 | (9.5) |
   Asian/Pacific Islander | 16 044 | (3.6) |
   American Indian/Alaska Native | 5510 | (1.2) |
   Other | 4606 | (1.0) |
   Unknown | 14 786 | (3.3) |