Résumé :
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[BDSP. Notice produite par INIST-CNRS 8npR0xBG. Diffusion soumise à autorisation]. The authors examined the association between menstrual characteristics and time to pregnancy among 2,653 Danish women enrolled in a prospective cohort study (2007-2009). Menstrual characteristics were reported at baseline. Outcome data were updated bimonthly until pregnancy, fertility treatment, loss to follow-up, or end of observation (12 cycles). Adjusted fecundability ratios and 95% confidence intervals were estimated by using discrete-time Cox regression models. Relative to average cycle lengths (27-29 days), fecundability ratios for cycle lengths=34 days were 0.64 (95% confidence interval (CI) : 0.49,0.84), 0.94 (95% CI : 0.77,1.13), 1.10 (95% CI : 0.97,1.25), 1.35 (95% CI : 1.06,1.73), and 1.17 (95% CI : 0.91,1.49), respectively. Compared with cycles that regularized within 2 years after menarche, fecundability ratios for cycles that regularized 2-3 and>=4 years after menarche were 0.90 (95% CI : 0.80,1.02) and 0.89 (95% CI : 0.77,1.03), respectively. Fecundability ratios were 0.87 (95% CI : 0.72,1.05) comparing
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