Table 3.

Odds ratios for association between gestational age at birth (1973–1979) and thyroid hormone prescription (≥1/year) in young adulthood (ages 25.5–37.0 years)

	Gestational Age, OR (95% CI)
	<37 weeks (N=27,935)	23–31 weeks (N=2,062)	32–36 weeks (N=25,873)	37–42 weeks (N=583,322)	≥43 weeks (N=18,549)
All individuals (N=629,806)
Unadjusted	1.0 (0.95, 1.13)	1.55 (1.18, 2.03)	0.99 (0.90, 1.09)	1.00	1.08 (0.97, 1.20)
Adjusted Model 1*	1.11 (1.01, 1.21)	1.71 (1.30, 2.24)	1.06 (0.96, 1.17)	1.00	1.04 (0.94, 1.16)
Adjusted Model 2†	1.11 (1.01, 1.21)	1.70 (1.29, 2.23)	1.06 (0.96, 1.17)	1.00	1.03 (0.92, 1.14)
Singletons (N=619,668)
Unadjusted	1.00 (0.90, 1.10)	1.46 (1.08, 1.96)	0.96 (0.87, 1.06)	1.00	1.08 (0.978, 1.20)
Adjusted Model 1*	1.08 (0.97, 1.19)	1.60 (1.19, 2.15)	1.04 (0.93, 1.15)	1.00	1.04 (0.93, 1.16)
Adjusted Model 2†	1.08 (0.98, 1.19)	1.59 (1.18, 2.14)	1.04 (0.94, 1.15)	1.00	1.02 (0.91, 1.13)
Twins (N=10,138)
Unadjusted	1.53 (1.11, 2.11)	2.36 (1.19, 4.65)	1.44 (1.03, 2.02)	1.00	2.32 (0.84, 6.42)
Adjusted Model 1*	1.54 (1.11, 2.14)	2.69 (1.34, 5.38)	1.44 (1.02, 2.03)	1.00	2.06 (0.72, 5.87)
Adjusted Model 2†	1.54 (1.11, 2.14)	2.62 (1.30, 5.27)	1.44 (1.02, 2.03)	1.00	2.03 (0.68, 6.049)

^*Adjusted for age, gender, maternal age at delivery, maternal marital status, maternal education, family income, and maternal prescription of thyroid hormones (≥1/year) during the follow-up period (7/1/2005 through 12/31/2009).

^†Adjusted for the same variables included in Adjusted Model 1, and fetal growth.