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Prepregnancy folate intake and adjusted absolute risks of spontaneous abortion.
(A) Total folate intake in quintiles. (B) Supplemental folate intake in categories. Adjusted risks are presented for the average age (35 years), total energy intake (1700 kcal/day), year (1992), body mass index (18.5–24.9 kg/m2), smoking status (never smoker), physical activity (9–17.9 MET-h/wk), history of infertility (none), marital status (married), and race (white) in our cohort.
