Table 3.

Associations Between Urinary Log Phytoestrogen Concentrations (nmol/L) and Length of All Menstrual Cycles During Follow-Up

		<26 days			26–35 days	>35 days			Continuous
		OR	95% CI			OR	95% CI		β b	95% CIb
Genistein	Unadjusted	1.01	0.88	1.16	Ref	1.01	0.83	1.21	-0.007	-0.033	0.020
	Adjusteda	1.02	0.85	1.22	Ref	1.02	0.71	1.47	0.007	-0.003	0.040
Daidzein	Unadjusted	1.00	0.88	1.15	Ref	0.98	0.81	1.18	-0.018	-0.044	0.009
	Adjusteda	0.99	0.83	1.19	Ref	0.97	0.67	1.40	-0.008	-0.041	0.025
O-DMA	Unadjusted	0.98	0.87	1.10	Ref	0.96	0.82	1.13	-0.020	-0.042	0.003
	Adjusteda	0.96	0.82	1.11	Ref	1.01	0.75	1.35	0.0005	-0.028	0.027
Equol	Unadjusted	1.03	0.85	1.25	Ref	0.99	0.75	1.30	-0.044	-0.082	-0.006
	Adjusteda	1.00	0.77	1.27	Ref	1.00	0.59	1.69	-0.039	-0.086	0.009
Total Isoflavones	Unadjusted	1.01	0.87	1.17	Ref	0.99	0.81	1.21	-0.016	-0.044	0.012
	Adjusteda	1.02	0.87	1.20	Ref	0.91	0.66	1.27	-0.016	-0.046	0.013
Enterodiol	Unadjusted	1.00	0.85	1.17	Ref	0.96	0.77	1.19	-0.029	-0.060	0.002
	Adjusteda	0.98	0.81	1.19	Ref	1.01	0.69	1.48	-0.013	-0.049	0.022
Enterolactone	Unadjusted	1.02	0.88	1.19	Ref	0.95	0.78	1.16	-0.034	-0.060	-0.006
	Adjusteda	1.04	0.87	1.24	Ref	0.96	0.69	1.34	-0.016	-0.046	0.015
Total Lignans	Unadjusted	1.03	0.87	1.21	Ref	0.94	0.75	1.17	-0.040	-0.072	-0.009
	Adjusteda	1.03	0.85	1.25	Ref	0.94	0.65	1.35	-0.023	-0.056	0.011
Total Phytoestrogens	Unadjusted	1.04	0.86	1.26	Ref	0.93	0.72	1.21	-0.043	-0.080	-0.007
	Adjusteda	1.07	0.87	1.32	Ref	0.85	0.55	1.29	-0.042	-0.080	-0.003

Bold values indicate P <0.05.

Abbreviations: CI, confidence interval; O-DMA, O-desmethylangolensin; OR, odds ratio.

^a Models adjusted for age, BMI, race, urinary creatinine, exercise (questionnaire), supplement use (yes/no), lipids, lead, cadmium, cotinine, parity conditional on gravidity, frequency of alcohol consumption, and sum of the other phytoestrogens (log).

^b β and 95% CIs calculated by β/10; interpreted as: the change in cycle length (by day) per 10% increase in phytoestrogen concentration.