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Table 3 Relative risks (RR) and their 95 % confidence intervals (CI) on the association between alcohol intake and breast cancer risk by body mass index (BMI) in the Swedish Women’s Lifestyle and Health study

From: Alcohol consumption, body mass index and breast cancer risk by hormone receptor status: Women’ Lifestyle and Health Study

      BMI
   <=25 kg/m2    >25 kg/m2
Alcohol intake (g/day) No. of cases RR (95 % CI) No. of cases RR (95 % CI) p-interaction
Total breast cancer (n = 1,385)      
 0 150 1.0 86 0.99 (0.76–1.29) 0.59
 0.1–5 418 1.05 (0.87–1.26) 181 1.00 (0.80–1.24)  
 5.1–15 339 1.19 (0.98–1.44) 135 1.08 (0.86–1.37)  
  > 15 56 1.32 (0.97–1.81) 20 0.88 (0.55–1.41)  
 Per 5 g/day increase   1.03 (1.00–1.05)   0.96 (0.88–1.04)  
ER(+)/PR(+) breast cancer (n = 718)      
 0 71 1.0 46 1.08 (0.75–1.57) 0.69
 0.1–5 217 1.14 (0.87–1.49) 109 1.23 (0.91–1.66)  
 5.1–15 167 1.22 (0.92–1.61) 72 1.18 (0.85–1.65)  
  > 15 26 1.28 (0.81–2.03) 10 0.90 (0.46–1.76)  
 Per 5 g/day increase   1.03 (0.99–1.06)   0.93 (0.83–1.05)  
ER(+)/PR(−) breast cancer (n = 196)      
 0 23 1.0 10 0.69 (0.33–1.45) 0.98
 0.1–5 55 0.94 (0.58–1.53) 23 0.77 (0.43–1.39)  
 5.1–15 55 1.29 (0.79–2.13) 20 0.98 (0.53–1.81)  
  > 15 7 1.06 (0.45–2.50) 3 0.80 (0.24–2.69)  
 Per 5 g/day increase   1.02 (0.96–1.09)   0.98 (0.82–1.18)  
ER(−)/PR(−) breast cancer (n = 187)      
 0 17 1.0 19 1.95 (1.01–3.76) 0.04
 0.1–5 60 1.29 (0.75–2.22) 21 1.01 (0.53–1.93)  
 5.1-15 44 1.31 (0.74–2.30) 15 1.03 (0.51–2.08)  
  > 15 10 1.96 (0.89–4.34) 1 0.36 (0.05–2.74)  
 Per 5 g/day increase   1.02 (0.94–1.11)   0.80 (0.59–1.09)  
  1. Adjusted models were adjusted for educational attainment (0–11 years/>11 years), history of breast cancer in mother and/or sister (Yes/No), smoking habits (current/former/never smokers), age at menarche (years), parity at baseline (0, 1, 2, 3, and >3), age at the first child birth (years), total breast feeding duration (months), and oral contraceptive use (current/former/never)
  2. ER estrogen receptor, PR progesterone receptor