Table 3.

Association between use of combinations of fertility indicators (time varying) and fecundability

	Time varying fertility indicator use
	No. of pregnancies	No. of cycles	Unadjusted		Adjusteda
			FR	95% CI	FR	95% CI
No fertility indicator use	669	5,464	1.00	Ref	1.00	Ref
Any fertility indicator use	2,664	17,148	1.41	1.30–1.53	1.31	1.21–1.42
BBT only	7	44	1.37	0.70–2.67	1.39	0.71–2.70
Urine LH only	38	421	0.84	0.61–1.14	0.81	0.59–1.10
Cervical fluid only	10	147	0.63	0.33–1.21	0.61	0.32–1.16
Charting days only	675	3,984	1.44	1.30–1.59	1.35	1.23–1.49
Charting days and BBT	48	355	1.19	0.90–1.56	1.17	0.89–1.53
Charting days and urine LH	272	1,939	1.34	1.18–1.53	1.24	1.08–1.41
Charting days and cervical fluid	455	2,934	1.38	1.23–1.54	1.29	1.16–1.45
Charting days, BBT, cervical fluid	218	1,439	1.35	1.18–1.56	1.25	1.09–1.44
Charting days, cervical fluid, urine LH	363	2,153	1.61	1.42–1.82	1.48	1.31–1.67
Charting days, BBT, urine LH	77	605	1.25	0.99–1.57	1.12	0.89–1.41
Charting days, BBT, cervical fluid, urine LH	453	2,752	1.58	1.41–1.77	1.42	1.27–1.59
Other methods	48	375	1.09	0.81–1.47	1.07	0.80–1.43

^a= Adjusted for female age, race/ethnicity, gravidity, BMI, income, current smoker, education, partner education, most recent method of birth control hormonal, hours of sleep per night, irregular cycles, history of infertility, prenatal supplement intake, marital status, intercourse frequency, history of benign gynecologic disorder, history of sexually transmitted infection, maternal problems getting pregnant

Abbreviations: BBT: Basal body temperature; Urine LH: Urine LH ovulation testing kit or stick