Table 2.

Distribution of thyroid hormones, FT4 and TSH in the total samples and according to sex and race/ethnicity, at age three years.^*

	Child Sample		Prenatal Sample
FT4	Mean ± SD ng/dL	Range ng/dL	Mean ± SD ng/dL	Range ng/dL
Total Sample	(n=228) 1.43 ± 0.17	1.02 – 2.14	(n=180) 1.40 ± 0.19	1.03 – 2.24
Sex
Girls	(n=119) 1.43 ± 0.18	1.02 – 2.14	(n=98) 1.41 ± 0.19	1.03 – 2.14
Boys	(n=109) 1.42 ± 0.16	1.06 – 2.03	(n=82) 1.39 ± 0.20	1.06 – 2.24
Race/Ethnicity
Dominican Americans	(n=127) 1.42 ± 0.18	1.02 – 2.14	(n=113) 1.40 ± 0.21	1.03 – 2.24
African Americans	(n=101) 1.44 ± 0.16	1.10 – 1.75	(n=67) 1.40 ± 0.16	1.10 – 1.75
TSH	Mean ± SD uIU/mL	Range uIU/mL	Mean ± SD uIU/mL	Range uIU/mL
Total Sample	(n=229) 2.56 ± 1.21	0.61 – 7.04	(n=181) 2.62 ± 1.39	0.61 – 11.67
Sex
Girls	(n=120) 2.59 ± 1.23	0.61 – 7.04	(n=99) 2.67± 1.31	0.61 – 7.04
Boys	(n=109) 2.54 ± 1.18	0.70 – 6.84	(n=82) 256 ± 1.48	0.70 – 11.67
Race/Ethnicity
Dominican Americans	(n=128) 2.74 ± 1.16	0.68 – 7.04	(n=114) 2.86 ± 1.48	0.68 – 11.67
African Americans	(n=101) 2.34 ± 1.23	0.61 – 6.84	(n=67) 2.20 ± 1.11	0.61 – 5.10

^*FT4= free thyroxine; TSH= thyroid-stimulating hormone.