. Author manuscript; available in PMC: 2013 Jan 1.

Published in final edited form as: Am J Obstet Gynecol. 2011 Jul 29;206(1):72.e1–72.e7. doi: 10.1016/j.ajog.2011.07.033

Table 4.

Association between Folic Acid supplementation (per 100 mcg increase in average daily intake) one month before conception, during first trimester of pregnancy and asthma in the offspring at six years of age (n = 1499).

Folic Acid Supplementation		Unadjusted		Adjusted^a

( per 100mcg increase in daily intake )	OR	95% CI	OR	95% CI
Month before conception	0.93	0.89-.097	0.98	0.94-1.03
First Month	0.94	0.90-0.97	0.98	0.94-1.02
Second month	0.96	0.92-1.00	0.99	0.95-1.03
Third month	0.96	0.92-1.00	0.99	0.95-1.03
First trimester	0.92	0.87-0.97	0.98	0.93-1.04

Adjusted for household annual income (40 000 USD <vs.>40 000 USD), maternal marital status (married vs not married) and physician diagnosed maternal asthma (yes/no).