Skip to main content

Advertisement

Table 1 Comparisons of cases and controls by selected demographic characteristics and major risk factors in the Shanghai Breast Cancer Study

From: Genetic polymorphism in the manganese superoxide dismutase gene, antioxidant intake, and breast cancer risk: results from the Shanghai Breast Cancer Study

Characteristic Cases (n = 1125) Controls (n = 1197) P-valuea
Demographic factors    
   Age (years [mean ± SD]) 47.63 ± 8.00 47.20 ± 8.78 0.217
   Education, lower than middle school (%) 12.27 14.79 0.124
Major risk factors    
   Breast cancer in first-degree relatives (%) 3.38 2.26 0.101
   Ever had breast fibroadenoma (%) 9.78 5.26 < 0.001
   Age at menarche (years [mean ± SD]) 14.41 ± 1.64 14.71 ± 1.73 0.004
   Age at first live birthb (years [mean ± SD]) 26.82 ± 4.07 26.17 ± 3.83 < 0.001
   Age at menopausec (years [mean ± SD]) 48.17 ± 4.65 47.46 ± 4.95 0.036
   Physically active in past 10 years (%) 19.40 26.00 < 0.001
   Body mass index (mean ± SD) 23.54 ± 3.39 23.25 ± 3.45 0.047
   Waist-to-hip ratio (mean ± SD) 0.81 ± 0.06 0.80 ± 0.06 0.004
  1. aFrom χ2 test (categorical variables) or T test (continuous variables). bAmong parous women.
  2. cAmong postmenopausal women. SD, standard deviation.