Table 3. BC risk factors by place of residence.

	Urban			Rural
Factors	Case/control (n=735/631)	ORa	95% CI	Case/control (n=1131/1242)	ORa	95% CI
Height (in cm)
<160	592/546	1.00	—	971/1079	1.00	—
⩾160	96/74	1.27	0.87–1.86	154/156	1.16	0.89–1.52
Unknown	47/11	1.29	0.44–3.78	6/7	0.95	0.23–3.92
BMI (kg/m2)
<25	367/365	1.00	—	752/930	1.00	—
25–25.9	240/195	1.18	0.90–1.56	313/258	1.44	1.16–1.79
>30	81/60	0.98	0.64–1.49	60/47	1.63	1.06–2.51
Unknown	44/11	1.32	0.45–3.88	5/7	1.04	0.25–4.30
Waist size (in cm)
⩽85	421/420	1.00	—	767/984	1.00	—
>85	274/202	1.31	0.97–1.77	356/251	1.46	1.14–1.86
Unknown	40/9	2.37	0.73–7.64	8/7	1.28	0.33–4.92
Hip size (in cm)
⩽100	472/496	1.00	—	924/1125	1.00	—
>100	222/126	2.00	1.41–2.84	199/110	1.80	1.30–2.49
Unknown	41/9	3.25	1.04–10.18	8/7	1.32	0.34–5.10
WHR ratio
⩽0.85	232/194	1.00	—	324/363	1.00	—
>0.85	462/428	0.81	0.62–1.07	799/872	0.86	0.70–1.06
Unknown	41/9	2.14	0.68–6.73	8/7	1.08	0.28–4.16
Body size at 10 years b
Figure 1	212/182	1.00	—	446/544	1.00	—
Figure 2	413/361	0.86	0.64–1.14	528/596	1.03	0.85–1.25
Figure 3	76/72	0.78	0.49–1.22	110/67	1.69	1.17–2.44
Figures 4–9	34/16	1.48	0.71–3.04	47/35	1.49	0.90–2.48
Body size at 20-years b
Figures 1+2	189/171	1.00	—	368/451	1.00	—
Figure 3	333/299	0.87	(0.64–1.18)	515/607	0.95	0.78–1.17
Figures 4–9	213/161	0.95	(0.67–1.35)	248/184	1.42	1.09–1.85
Current body size b
Figures 1+2+3	179/197	1.00	—	137/186	1.00	—
Figures 4–9	556/434	1.17	0.84–1.62	994/1056	1.12	0.79–1.58

BC=breast cancer; BMI=body mass index; CI=confidence interval; OR=odds ratio; WHR=waist-to-hip ratio.

^aOR adjusted for age, centre, religion, marital status, education, socioeconomic status, parity, age at 1st childbirth, duration of breastfeeding, menopausal status, physical activity and variables in the table (where appropriate).

^bRefer Figure 1.