TABLE 3.
Blood iodine concentrations in CH cases and controls stratified by pregnancy and sociodemographic characteristics1
| Cases, ng/mL | Controls, ng/mL | P value | |
|---|---|---|---|
| Race/ethnicity | |||
| Asian | 20.1 (10.7–29.9) | 23.7 (13.0–32.9) | 0.08 |
| Black | 28.3 (19.2–36.8) | 21.3 (11.9–31.2) | 0.17 |
| Hispanic | 19.9 (12.6–28.8) | 19.8 (12.8–29.4) | 0.80 |
| Non-Hispanic white | 20.8 (11.2–33.4) | 20.1 (12.4–32.0) | 0.83 |
| Other | 19.4 (12.9–24.2) | 23.1 (10.5–37.2) | 0.42 |
| Nursery type2 | |||
| Regular nursery | 19.4 (11.8–28.8) | 20.6 (12.8–31.1) | 0.15 |
| NICU | 22.7 (16.4–32.1) | 17.3 (8.30–26.6) | 0.01 |
| Other | 20.8 (12.4–31.9) | 22.1 (15.9–28.1) | 0.84 |
| Home | 29.9 (29.9–29.9) | NA3 | NA3 |
| Sex2 | |||
| Female | 19.2 (12.0–28.6) | 20.0 (12.4–29.0) | 0.63 |
| Male | 21.6 (12.2–33.2) | 20.6 (12.8–32.7) | 0.71 |
| Birth weight, g | |||
| <1500 | 29.9 (22.0–37.3) | 48.0 (24.5–95.8) | 0.40 |
| 1500–2499 | 16.6 (10.7–28.5) | 15.7 (8.25–26.1) | 0.34 |
| 2500–3000 | 20.8 (11.7–29.8) | 20.6 (13.1–32.3) | 0.59 |
| >3000 | 19.9 (12.1–29.5) | 20.4 (12.6–30.6) | 0.69 |
| Gestational age at birth2 | |||
| Preterm (<37 wk) | 19.9 (13.3–33.4) | 17.3 (8.50–28.8) | 0.30 |
| Term (37–41 wk) | 19.9 (11.9–29.0) | 20.5 (12.7–31.0) | 0.28 |
| Post-term (≥42 wk) | 27.6 (17.2–31.5) | 21.6 (11.7–29.1) | 0.60 |
1
Values are median (IQR). CH, congenital hypothyroidism; NA, not applicable; NICU, neonatal intensive care unit.
2
Infants with unavailable data were excluded from analysis.
3
There were no home births in the control group.