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Table 2 Distribution of health behaviours and breast cancer risk factors by menopausal status and ethnic group

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

Premenopausal Māori (n = 337)   Non-Māori (n = 650)  
Case Control   Case Control  
(n = 41) (n = 296)   (n = 279) (n = 371)  
n % n % P n % n % P P*
Maternal breast cancer
No 37 90.2 283 95.6   247 88.5 344 92.7   
Yes 4 9.8 13 4.4 0.141 32 11.5 27 7.3 0.066 0.119
Oral contraceptive use
No 5 12.2 29 9.8   27 9.7 35 9.4   
Yes 36 87.8 267 90.2 0.633 252 90.3 336 90.6 0.917 0.874
History of diabetes            
No 33 80.5 279 94.3   271 97.1 359 96.8   
Yes 8 19.5 17 5.7 0.002 8 2.9 12 3.2 0.788 0.114
Deprivation index            
Deciles 1–4 (least deprived) 10 24.4 91 30.8   122 43.7 199 53.6   
Deciles 5-7 10 24.4 94 31.8   90 32.3 108 29.1   
Deciles 8–10 (most deprived) 21 51.2 111 37.5 0.241 67 24.0 64 17.3 0.026 <0.001
Parity            
Nulliparous 3 7.30 48 16.2   46 16.5 51 13.8   
1-2 23 56.1 117 39.5   152 54.5 192 51.8   
3+ 15 36.6 131 44.3 0.093 81 29.0 128 34.5 0.286 0.007
Age at menarche (mean year) 12.8 ± 1.7   12.6 ± 1.6   0.583 12.7 ± 1.5   13.0 ± 1.5   0.017 <0.001
Age (mean year) 43.3 ± 7.1   42.4 ± 6.4   0.272 44.6 ± 5.4   44.9 ± 5.7   0.575 <0.001
Postmenopausal Māori (n = 439)   Non-Māori (n = 1785)  
Case Control   Case Control  
(n = 85) (n = 354)   (n = 688) (n = 1097)  
n % n % P n % n % P P*
Maternal breast cancer
No 77 90.6td 336 94.9   611 88.8 1029 93.8   
Yes 8 9.4 18 5.1 0.129 77 11.2 68 6.2 <0.001 0.440
HRT use            
No 63 74.1 274 77.4   445 64.7 730 66.6   
Yes 22 25.9 80 22.6 0.520 243 35.3 367 33.4 0.419 <0.001
Oral contraceptive use            
No 29 34.1 91 25.7   219 31.8 242 22.1   
Yes 56 65.9 263 74.3 0.118 469 68.2 855 77.9 <0.001 0.156
History of diabetes            
No 69 81.2 302 85.3   625 90.8 1017 92.7   
Yes 16 18.8 52 14.7 0.344 63 9.2 80 7.3 0.158 <0.001
Deprivation index
Deciles 1–4 (least deprived) 9 10.6 95 26.8   254 36.9 560 51.1   
Deciles 5-7 16 18.8 95 26.8   230 33.4 335 30.5   
Deciles 8–10 (most deprived) 60 70.6 164 46.3 <0.001 204 29.7 202 18.4 <0.001 <0.001
Parity
Nulliparous 6 7.1 25 7.1   80 11.6 95 8.7   
1-2 25 29.4 113 31.9   257 37.4 438 39.9   
3+ 54 63.5 216 61.0 0.901 351 51.0 564 51.4 0.104 0.007
Age at menarche (mean year) 12.4 ± 1.6   12.7 ± 1.7   0.504 12.9 ± 1.5   12.8 ± 1.4   0.654 0.036
Age (mean year) 59.5 ± 8.3   58.6 ± 7.6   0.432 64.6 ± 10.0   63.5 ± 9.1   0.013 <0.001
  1. P value: chi squared test for categorical variables and kruskal wallace test for continuous variables.
  2. P* value: chi squared test between Māori and non-Māori controls.