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Table 3 Adjusted odds ratios (OR) and 95% confidence intervals (CI) for the association between the healthy lifestyle index score and breast cancer by menopausal status and ethnicity

From: Healthy lifestyle and risk of breast cancer for indigenous and non-indigenous women in New Zealand: a case control study

Healthy lifestyle index score Māori Non-Māori  
  Case % Control % OR 95% CI Case % Control % OR 95% CI P (Ethnic interaction)
Premenopausal n = 41 n = 296    n = 279 n = 371    
T1 (unhealthy score) 46.3 42.2 1.00 Reference 40.9 39.1 1.00 Reference  
T2 34.2 29.4 1.03 (0.47 to 2.26) 27.6 32.6 0.85 (0.58 to 1.25)  
T3 (healthy score) 19.5 28.4 0.69 (0.27 to 1.74) 31.5 28.3 1.23 (0.83 to 1.83) 0.389
P (trend)    0.487     0.371   
Per score unit increase    0.91 (0.69 to 1.20)    1.07 (0.94 to 1.23)  
Postmenopausal n = 85 n = 354    n = 688 n = 1097    
T1 (unhealthy score) 50.6 41.8 1.00 Reference 49.7 45.1 1.00 Reference  
T2 34.1 29.4 0.99 (0.56 to 1.73) 28.5 29.1 0.97 (0.77 to 1.22)  
T3 (healthy score) 15.3 28.8 0.47 (0.23 to 0.94) 21.8 25.8 0.86 (0.67 to 1.11) 0.212
P (trend)    0.054     0.262   
Per score unit increase    0.86 (0.70 to 1.05)    0.97 (0.90 to 1.05)  
P (Menopausal interaction)    0.683     0.173   
  1. Adjusted for covariates: parity, age at menarche, history of maternal breast cancer, oral contraceptive use, HRT use, diabetes, SEP, and age.