Table 1

Comparison of cases and controls by selected demographic and risk factors, the Shanghai Breast Cancer Study, 1996–1998

CharacteristicaCases (n = 117)Controls (n = 117)Pb
Demographic factors
 Age (years)56.8 ± 4.356.9 ± 4.10.63
 Education elementary and under (%)31.634.20.63
Nondietary risk factors
 First degree relative with breast cancer (%)5.12.60.32
 Ever diagnosed with fibroadenoma (%)7.82.60.06
 BMIa24.6 ± 3.823.9 ± 3.70.15
 WHRa0.81 ± 0.060.81 ± 0.060.80
 Ever exercise (%)35.047.90.06
 Age at menarchea14.9 ± 1.815.1 ± 1.90.50
 Age at menopause (years)48.8 ± 4.348.2 ± 4.40.22
 Nulliparity3.44.30.74
 Number of live birthc2.2 ± 1.02.2 ± 0.90.36
 Age at first live birth (years)c25.6 ± 4.824.2 ± 3.80.01
Nutritional factors
 Total energy intake (kcal/day)1895.2 ± 408.11866.1 ± 462.60.62
 Total fat intake (g/day)d33.8 ± 1.0236.5 ± 1.020.07
 Total fruit and vegetable intake (g/day)d482.0 ± 24.3481.4 ± 24.30.99
 Soy protein intake (g/day)d10.8 ± 0.813.2 ± 0.80.03
 Total meat (g/day)d83.0 ± 5.076.7 ± 5.00.37
  • a Unless otherwise specified, mean ± SD are presented.

  • b Ps were from the McNemar’s test (for categorical variables) or paired Student t test (for continuous variables).

  • c Among ever pregnant women.

  • d Total energy adjusted means were presented.