Table 2. Crude and adjusted odds ratios (95% CIs) for the associations between prenatal arsenic exposure and adverse pregnancy outcomes.

Model	Urinary total arsenic (μg/g creatinine)

	17 – 555	556 – 3,712	P-value
Any adverse pregnancy outcome
Unadjusted	1 (ref)	1.53 (1.00, 2.35)	0.05
Adjusted for maternal age	1 (ref)	1.58 (1.02, 2.42)	0.04
Fully adjusted^a	1 (ref)	1.59 (1.02, 2.46)	0.04
Stillbirth/spontaneous abortion
Unadjusted	1 (ref)	1.50 (0.92, 2.45)	0.10
Adjusted for maternal age	1 (ref)	1.51 (0.93, 2.47)	0.10
Fully adjusted^a	1 (ref)	1.57 (0.96, 2.56)	0.07
Stillbirth
Unadjusted	1 (ref)	2.41 (1.00, 5.85)	0.05
Adjusted for maternal age	1 (ref)	2.41 (0.99, 5.85)	0.05
Fully adjusted^b	1 (ref)	2.50 (1.04, 6.01)	0.05
Spontaneous abortion
Unadjusted	1 (ref)	1.26 (0.72, 2.20)	0.41
Adjusted for maternal age	1 (ref)	1.27 (0.72, 2.24)	0.42
Fully adjusted^a	1 (ref)	1.33 (0.76, 2.32)	0.32
Therapeutic/elective abortion
Unadjusted	1 (ref)	1.67 (0.75, 3.73)	0.21
Adjusted for maternal age	1 (ref)	1.69 (0.75, 3.81)	0.21
Fully adjusted^a	1 (ref)	1.58 (0.70, 3.56)	0.27

Adjusted for maternal age (years), maternal education (years), BEST treatment assignment, and skin lesion severity.

Adjusted for maternal age (years), maternal education (years), BEST treatment assignment, skin lesion severity, parity, and previous stillbirth.