Table V.

Adjusted PRs (postfortification to prefortification periods) of spina bifida cases by lesion level by maternal race/ethnicity, maternal age, and infant sex

	All spina bifida cases*		Upper lesion level cases		Lower lesion level cases
Characteristics	APR, 95% CI	P value	APR, 95% CI	P value	APR, 95% CI	P value
Total	0.77 (0.69-0.86)	—	0.28 (0.23-0.33)	—	0.93 (0.81-1.07)	—
Maternal race/ethnicity
White, non-Hispanic	0.74 (0.62-0.87)	Ref	0.21 (0.17-0.27)	Ref	0.91 (0.79-1.06)	Ref
Black, non-Hispanic	1.23 (1.10-1.37)	<.0001	0.64 (0.46-0.89)	<.0001	1.42 (1.25-1.60)	<.0001
Hispanic	0.81 (0.72-0.90)	0.10	0.31 (0.26-0.38)	0.003	0.93 (0.83-1.05)	0.67
Maternal age
<20 y	0.77 (0.62-0.96)	0.65	0.68 (0.45-1.02)	<.0001	0.77 (0.60-0.97)	0.04
20-34 y	0.79 (0.68-0.94)	Ref	0.23 (0.20-0.26)	Ref	0.98 (0.82-1.16)	Ref
35+ y	0.93 (0.67-1.30)	0.40	0.45 (0.18-1.13)	0.12	1.08 (0.86-1.35)	0.58
Infant sex
Female	0.72 (0.58-0.89)	Ref	0.28 (0.19-0.42)	Ref	0.85 (0.70-1.04)	Ref
Male	0.81 (0.69-0.95)	.46	0.28 (0.22-0.36)	.98	0.99 (0.78-1.26)	.39

APR, adjusted PR (ratio of prevalence postfortification to prevalence prefortification, adjusted for state program).

P values are for the pairwise testing of APR against each referent group for maternal race/ethnicity, maternal age, or infant sex.

^*All cases include unknown lesion level.