. 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 3.

Association between Folic Acid supplementation one to three months before conception, during first trimester of pregnancy and asthma in offspring at six years of age (n = 1499).

Folic Acid Supplementation		Unadjusted		Adjusted^a

(OR associated with use versus non-use)	OR	95% CI	OR	95% CI
Month before conception	0.62	0.47-0.83	0.95	0.68-1.32
First Month	0.60	0.45-0.80	0.89	0.69-1.23
Second month	0.79	0.56-1.11	1.31	0.89-1.93
Third month	0.72	0.48-1.07	0.94	0.62-1.43
First trimester	0.79	0.48-1.30	1.23	0.73-2.07

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).