Table 1.

Characteristics of subjects by gestational age at screening (mean± SD)

	≤ 11 wk n = 235	12-19 wk n = 301	≥20 wk n = 425	p value
Age (year) (mean± SD)*	26.22± 4.46	26.59± 4.43	26.46± 4.80	Non-significant
primiparous (%)**	24.7	27.6	29.4	Non-significant
Serum zinc (µg/dl) (mean± SD) *	91.02± 25.99	88.62± 27.06	88.70± 25.08	Non-significant
Zinc deficiency*** (%) **	16.2	16	17.3	Non-significant

^*One-way ANOVA test

^**χ² test

^***<66 µgr/dl