Table 2.

Bivariate analysis of maternal selenium concentrations and pregnancy outcomes. ^a

Characteristic	Total (n=113)	Low selenium (n=23)	Normal selenium (n=90)	OR (95% CI)	P value
Pregnancy duration at delivery
Preterm (<37 wk)	11 (9.7)	7 (30.4)	4 (4.4)	6.85 (3.11–10.05)	0.011
Term (≥37 wk)	102 (90.3)	16 (69.6)	86 (95.6)	1.00 (ref.)
Delivery weight for term neonates b
<2500 g	12 (11.8)	9 (56.2)	3 (3.5)	16.06 (9.81–33.47)	0.003
≥2500 g	90 (88.2)	7 (43.8)	83 (96.5)	1.00 (ref.)
Maternal death
Yes	3 (2.7)	1 (4.3)	2 (2.2)	1.96 (0.61–7.12)	0.498 c
No	110 (97.3)	22 (95.7)	88 (97.8)	1.00 (ref.)
Perinatal death
Yes	8 (7.1)	2 (8.7)	6 (6.7)	1.29 (1.03–5.97)	0.735
No	105 (92.9)	21 (91.3)	84 (93.3)	1.00 (ref.)

Abbreviations: CI, confidence interval; OR, odds ratio.

^aValues are given as number (percentage) unless indicated otherwise.

^bn=102.

^cFisher exact test.