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Table 1 Comparison of cases and controls on demographics and selected breast cancer risk factors

From: Associations of anthropometric measures on breast cancer risk in pre- and postmenopausal women—a case-control study

  Premenopausal women Postmenopausal women All women
n = 239 n = 248  
Cases (61) mean value (SD) Controls (178) mean value (SD) P value Cases (132) mean value (SD) Controls (116) mean value (SD) P value Cases (193) mean value (SD) Controls (294) mean value (SD) P value
Age at enrollment (years) 45.1 (5.3) 41.8 (6.1) <0.01 61.4 (10.4) 63.4 (10.2) 0.2 56.2 (11.8) 50.4 (13.2) <0.01
Age at menarche (years) 14.0 (1.6) 13.9 (1.4) 0.7 14.1 (1.6) 14.1 (1.9) 0.7 14.1 (1.6) 14.0 (1.6) 0.8
Age at first birth (years) 24.4 (4.5) 24.2 (4.1) 1.0 24.7 (4.3) 24.6 (4.5) 0.7 24.6 (4.4) 24.3 (4.2) 0.6
Age at last birth (years) 29.3 (7.1) 27.7 (1.9) 0.7 30.5 (5.5) 29.5 (5.1) 0.3 30.1 (6.1) 28.2 (4.9) <0.01
Number of parity 1.9 (1.3) 1.5 (0.9) 0.7 2.1 (1.4) 1.5 (1.3) <0.01 2.0 (1.4) 1.5 (1.1) <0.01
Family history of breast cancer in first-degree relatives 10 49 0.07 16 34 <0.01 26 83 <0.01
Education    0.29    0.13    <0.01
 Primary 15 33   57 34   72 67  
 Vocational 7 31   5 8   12 39  
 Secondary 21 47   49 48   70 94  
 Higher 18 67   21 25   39 92  
Number of miscarriages 1.0 (3.7) 0.3 (0.7) 0.1 0.6 (1.0) 0.5 (0.8) 0.4 0.7 (2.2) 0.4 (0.7) <0.01
Age at menopause (years) 48.7 (5.2) 49.5 (4.7) 0.8 48.7 (5.2) 49.5 (4.7) 0.8