TABLE 3.

Association between breast cancer and physical activity among postmenopausal women recently exposed to hormones

	Non-Hispanic white			Hispanic/American Indian
	Controls	Cases		Controls	Cases
	No.	No.	OR (95% CI)*	No.	No.	OR (95% CI)
Total MET hr/wk referent year
<5hr/wk	168	173	1.00	97	81	1.00
5–14.9 hr/wk	185	168	0.86 (0.63, 1.16)	96	69	0.84 (0.54, 1.31)
15–29.9 hr/wk	174	151	0.79 (0.58, 1.08)	58	50	1.00 (0.61, 1.66)
≥30 hr/wk	178	204	0.99 (0.73, 1.35)	79	69	0.99 (0.62, 1.56)
p Trend			0.89			0.91
Vigorous hr/wk referent year
None	259	279	1.00	145	120	1.00
<1 hr/wk	233	205	0.72 (0.55, 0.94)	101	80	0.95 (0.64, 1.42)
1–2.9 hr/wk	114	126	0.89 (0.65, 1.22)	45	38	1.01 (0.59, 1.71)
≥3 hr/wk	99	86	0.71 (0.50, 1.01)	39	31	0.89 (0.51, 1.56)
p Trend			0.09			0.75
Lifetime total activity score
0–3	125	138	1.00	90	74	1.00
4–6	240	203	0.72 (0.53, 0.99)	105	88	1.01 (0.66, 1.56)
7–9	216	239	0.95 (0.69, 1.30)	105	79	0.85 (0.54, 1.32)
10–12	124	116	0.75 (0.52, 1.07)	30	28	1.06 (0.56, 1.99)
p Trend			0.49			0.72
Lifetime vigorous hr/wk
None	68	58	1.00	42	39	1.00
< 1 hr/wk	222	224	1.15 (0.77, 1.72)	108	98	1.12 (0.65, 1.92)
1–2.9 hr/wk	233	227	1.03 (0.68, 1.54)	108	72	0.76 (0.44, 1.32)
≥3 hr/wk	182	187	1.07 (0.71, 1.64)	72	60	0.93 (0.52, 1.66)
p Trend			0.88			0.36
Total MET hr/wk at age 50
<5 hr/wk	104	81	1.00	58	52	1.00
5–14.9 hr/wk	128	139	1.35 (0.92, 1.98)	65	42	0.61 (0.35, 1.09)
15–29.9 hr/wk	111	106	1.15 (0.77, 1.71)	46	39	0.94 (0.52, 1.72)
≥30 hr/wk	211	240	1.36 (0.96, 1.93)	64	42	0.60 (0.33, 1.07)
p Trend			0.20			0.22
Vigorous hr/wk at age 50
None	209	210	1.00	108	94	1.00
< 1 hr/wk	132	134	1.00 (0.73, 1.37)	59	35	0.68 (0.40, 1.16)
1–2.9 hr/wk	92	89	0.89 (0.63, 1.28)	37	25	0.79 (0.43, 1.44)
≥3 hr/wk	119	131	1.01 (0.73, 1.39)	29	21	0.71 (0.37, 1.38)
p Trend			0.87			0.23
Total MET hr/wk at age 30
<5 hr/wk	129	124	1.00	94	71	1.00
5–14.9 hr/wk	124	134	1.19 (0.83, 1.70)	63	52	1.11 (0.67, 1.83)
15–29.9 hr/wk	118	117	1.01 (0.70, 1.46)	60	44	1.01 (0.60, 1.69)
≥30 hr/wk	331	319	0.99 (0.73, 1.34)	109	101	1.20 (0.78, 1.85)
p Trend			0.60			0.46
Vigorous hr/wk at age 30
None	236	243	1.00	132	125	1.00
< 1 hr/wk	128	134	1.02 (0.75, 1.39)	80	44	0.63 (0.40, 1.00)
1–2.9 hr/wk	147	123	0.76 (0.56, 1.04)	50	40	0.84 (0.51, 1.39)
≥3 hr/wk	189	194	0.90 (0.68, 1.19)	64	58	0.88 (0.56, 1.38)
p Trend			0.24			0.54
Total MET hrs/week at age 15
<15 hr/wk	185	225	1.00	114	100	1.00
15–39.9 hr/wk	174	144	0.70 (0.52, 0.95)	64	63	1.15 (0.73, 1.81)
40–89.9 hr/wk	157	152	0.80 (0.59, 1.08)	73	45	0.73 (0.45, 1.17)
≥90 hr/wk	185	172	0.74 (0.55, 0.99)	77	60	0.88 (0.56, 1.38)
p Trend			0.07			0.31
Vigorous hr/wk at age 15
None	217	237	1.00	121	107	1.00
<1 hr/wk	69	83	1.07 (0.73, 1.55)	30	29	1.23 (0.68, 2.24)
1–2.9 hr/wk	137	117	0.80 (0.59, 1.10)	53	51	1.13 (0.70, 1.85)
≥3 hr/wk	277	255	0.79 (0.61, 1.02)	122	81	0.79 (0.53, 1.19)
p Trend			0.04			0.29

CI = confidence interval; MET = metabolic equivalent of the task (value); OR = odds ratio.

^*ORs and 95% CIs adjusted for age, center, parity, body mass index, and energy intake.