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Table 1 Selected characteristics of breast cancer cases and controls, Delaware, 2000–2002

From: Case-control study of tobacco smoke exposure and breast cancer risk in Delaware

  cases (n = 287) controls (n = 311)  
Characteristic n % n % p-valuea
Age at interview (years)      
   40–49 53 18.5 63 20.3  
   50–59 74 25.8 94 30.2  
   60–69 87 30.3 77 24.8  
   70–80 73 25.4 77 24.7 0.32
Race      
   White 264 92.0 294 94.5  
   Black/Other 23 8.1 17 5.5 0.21
Educationb      
   <12 grades 30 10.5 14 4.5  
   12 grades 114 39.9 108 37.8  
   some college 108 37.8 148 47.6  
   post-college 34 11.9 41 13.2 < 0.01
Menopausal status      
   premenopausal 30 10.5 65 20.9  
   postmenopausal 257 89.6 246 79.1 < 0.01
Body mass index (kg/m2)b      
   15–24 107 37.3 122 39.6  
   25–29 102 35.5 114 37.0  
   30–88 78 27.2 72 23.4 0.56
Age at menarche (years)b      
   8–12 140 49.3 142 45.8  
   13–18 144 50.7 168 54.2 0.39
Number of Live Birthsb      
   nulliparousc 44 15.3 35 11.3  
   1–2 128 44.6 145 46.8  
   3–4 97 33.8 112 36.1  
   5–11 18 6.3 18 5.8 0.52
Age at 1st live birth (years)b      
   < 30 219 90.1 242 88.0  
   30+ 24 9.9 33 12.0 0.44
Oral contraceptive use      
   Never 120 41.8 110 35.4  
   Ever 167 58.2 201 64.6 0.11
Other hormone useb      
   Never 153 53.3 161 51.9  
   Ever 134 46.7 149 48.1 0.74
Family History of Breast Cancerb,c      
   No 220 77.7 257 82.9  
   Yes 63 22.3 53 17.1 0.11
Alcohol consumption      
   < 12 drinks in lifetime 37 12.9 49 15.8  
   ≥ 12 drinks in lifetime, but never had ≥ 1 drink per mo. for ≥ 6 mos 87 30.3 85 27.3  
   drank ≥ 1 drink per mo. for ≥ 6 mos 163 56.8 177 56.9 0.52
  1. a p-values based on chi-square test; p-values based on Mantel-Haenszel chi-square test for trend for the following variables: age, education, BMI, and age at first live birth
  2. b Numbers do not always sum to total number of cases and/or controls due to missing information
  3. c Includes 9 cases and 10 controls who reported 1+ pregnancies
  4. d Family history of breast cancer defined as mother or sister ever diagnosed with breast cancer