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. 2002 Apr 25;4(4):R8. doi: 10.1186/bcr445

Table 1.

Characteristics of the study subjects

Characteristic Cases (n = 237) Controls (n = 185) Chi-square P value
Age *
 < 45 years 53 38
 ≥ 45 years 184 147 0.20 0.65
Body mass index
 < 22 kg/m2 126 99
 ≥ 22 kg/m2 111 86 0.005 0.94
Age at menarche
 < 14 years 113 92
 ≥ 14 years 124 93 0.17 0.68
Age at first birth
 < 25 years 96 67
 ≥ 25 years 112 98
 No birth 29 20 1.36 0.51
Number of births
 < 2 56 43
 ≥ 2 181 142 0.009 0.93
Menopause state
 Premenopause 134 71
 Postmenopause 103 114 13.72 < 0.001
Alcohol
 < 1 day/week 184 148
 ≥ 1 day/week 53 37 0.35 0.56
Smoking
 Noncurrent 211 169
 Current 26 16 0.63 0.43
Family history of breast cancer (mother and /or sisters)
 No 207 173
 Yes 30 12 4.42 0.04

* Age at diagnosis for cases and at study enrollment for controls.