. Author manuscript; available in PMC: 2014 Aug 12.

Published in final edited form as: Cancer Causes Control. 2012 Feb 25;23(4):565–574. doi: 10.1007/s10552-012-9916-y

Table 6.

Waist circumference and breast cancer risk by body mass index in Nigerian women, 1998–2009

Waist circumference	Cases	Controls	Age-adjusted OR (95% CI)	Adjusted OR (95% CI)^†
*BMI < 25kg/m²*
45–81 cm	412	507	1.0 (ref.)	1.0 (ref.)
82–138 cm	194	96	2.03 (1.52–2.71)	1.91 (1.39–2.61)
P value			<0.001	<0.001
Mean ± SD	77.6±9.3	74.3±7.9
Per10 cm			1.31 (1.14–1.51)	1.26 (1.07–1.47)

*BMI ≥ 25kg/m²*
45–81 cm	65	74	1.0 (ref.)	1.0 (ref.)
82–138 cm	512	419	1.15 (0.79–1.68)	1.11 (0.73–1.68)
P value			0.46	0.62
Mean ± SD	92.9±10.7	90.8±9.8
Per10 cm			1.13 (1.00–1.27)	1.08 (0.95–1.23)

P for interaction^*			0.021	0.042

Abbreviations: BMI, body mass index; WHR, waist-hip ratio; OR, odds ratio; CI, confidence interval; SD, standard deviation

Interaction between waist circumference and body mass index

^†

Adjusted for age at diagnosis or interview (categorical), ethnicity, education (categorical), age at menarche (continuous), number of live birth (categorical), age at first live birth (continuous), duration of breastfeeding (categorical), menopausal status, family history of breast cancer, benign breast disease, hormonal contraceptive use, alcohol drinking, and height (continuous).

Categories of waist circumference are based on median in controls.