Physical activity and mammographic density in a cohort of postmenopausal Norwegian women; a cross-sectional study

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Table 4 Multivariate adjusted ^* mean (95%CI) of percent (%) mammographic density by moderate + strenuous physical activity (mins/week) for all women combined and stratified by BMI

VARIABLES	ALL		In strata of BMI
			< 25		≥ 25-29		≥ 30
	N = 2218		N = 1235		N = 732		N = 251
Moderate + strenuous activity (mins/week)
No activity	566	16.9 (16.3- 17.5)	287	20.9 (20.2- 21.6)	200	14.8 (14.2- 15.5)	79	8.0 (7.5- 8.5)
≤ 30	193	17.2 (16.1- 18.2)	90	21.9 (20.8- 23.1)	73	14.9 (13.9- 16.0)	30	8.4 (7.6- 9.2)
31- 45	265	17.2 (16.2- 18.2)	139	22.9 (21.8- 24.0)	84	13.0 (12.0 - 14.1)	42	7.5 (6.7- 8.3)
46- 100	435	18.5 (17.8- 19.1)	238	23.2 (22.4- 23.9)	149	13.8 (13.1- 14.6)	48	7.3 (6.6- 8.0)
101-180	426	19.1 (18.4- 19.8)	254	24.0 (23.2- 24.8)	136	12.5 (11.7 -13.3)	36	7.7 (6.8- 8.7)
>180	333	20.6 (20.0- 21.3)	227	25.4 (24.6- 26.1)	90	12.1 ( 11.2- 13.0)	18	7.2 (5.8- 8.6)
p for trend		0.81		0.06		0.001		0.51

^* Least square means and p values for trend from linear regression. Adjusted for age at mammography (continuous), years of education (≤ 11, 12–14, 15+), number of pregnancies (nulliparous, 1,2,3,4, 5–10), age at first full-term pregnancy for parous women (<20, 20–24, 25–29, 30+), postmenopausal hormone therapy (never, past, current), body mass index (continuous), light physical activity.