FIGURE 1.
Adjusted RRs (95% CIs) for spontaneous abortion by fine categories of prepregnancy alcohol intake: Nurses’ Health Study II, 1989–2009. The n shown is the number of pregnancies. Analyses were conducted with the use of a log-binomial generalized linear model with an exchangeable working correlation structure to compute RR estimates. The model was adjusted for age (continuous), total energy intake (continuous), year (continuous), BMI (in kg/m2; <18.5, 18.5–24.9, 25–29.9, ≥30, or missing), smoking status (never, former, current, or missing), physical activity (in MET-h/wk; <3, 3–8.9, 9–17.9, 18–26.9, 27–41.9, >42, or missing), history of infertility (no, yes, or missing), marital status (married or not married), race (white or other), caffeine intake (quintiles), and multivitamin use (yes, no, or missing). MET-h, metabolic equivalent task hours; SAB, spontaneous abortion.