Table 2.

Physical activity at baseline and time to pregnancy

	Pregnancies	Cycles	Unadjusted model		Adjusted model^a

			FR	95% CI	FR	95% CI
Vigorous physical activity, hrs/wk
None	500	2,856	1.00	(ref.)	1.00	(ref.)
<1	566	3,492	0.91	0.80, 1.04	0.88	0.77, 1.01
1	440	2,607	0.94	0.81, 1.08	0.87	0.76, 1.01
2	520	3,156	0.93	0.82, 1.07	0.84	0.73, 0.97
3–4	342	2,295	0.82	0.70, 0.95	0.73	0.63, 0.86
≥5	116	819	0.77	0.61, 0.96	0.68	0.54, 0.85
Moderate physical activity, hrs/wk
<1	161	1,150	1.00	(ref.)	1.00	(ref.)
1	227	1,543	1.02	0.82, 1.27	1.00	0.80, 1.25
2	538	3,273	1.17	0.96, 1.41	1.15	0.95, 1.40
3–4	720	4,283	1.19	0.99, 1.44	1.16	0.95, 1.40
≥5	838	4,976	1.20	0.99, 1.45	1.18	0.98, 1.43
Total metabolic equivalents, hrs/wk
<10	374	2,445	0.87	0.75, 1.09	0.95	0.82, 1.11
10–19	784	4,747	0.93	0.82, 1.05	0.96	0.85, 1.09
20–29	533	3,095	1.00	(ref.)	1.00	(ref.)
30–39	404	2,345	0.98	0.85, 1.13	0.97	0.84, 1.12
40–49	201	1,392	0.82	0.69, 0.98	0.81	0.68, 0.97
50–59	118	688	0.97	0.77, 1.20	0.93	0.75, 1.17
≥60	70	513	0.75	0.58, 0.99	0.74	0.56, 0.97

Note: FR = fecundability ratio, CI = confidence interval. Unadjusted model controls for cycle number.

Adjusted for cycle number, age, partner’s age, BMI, alcohol consumption, pack-years of smoking, intercourse frequency, and last method of contraception. Vigorous activity is adjusted for moderate activity, and vice versa.