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Table 1 Selected characteristics of cases and controls in the Swedish and the Finnish samples

From: Genetic variation of ESR1 and its co-activator PPARGC1B is synergistic in augmenting the risk of estrogen receptor-positive breast cancer

  Swedish sample Finnish sample
Characteristic Number Mean Pvaluea Number Mean Pvaluea
Entire study       
   Age (years) 1,257/1,464 63.11/63.12 0.96 2,214/1,265 56.07/40.88 < 1.00 × 10-4
   Age at first birth 1,072/1,321 25.50/24.76 2.00 × 10-4 1,185/- 26.43/- /
   Age at menopause 1,247/1,460 50.6/49.97 1.00 × 10-4 1,341/- 50.34/- /
   BMI (recent) 1,250/1,443 25.71/25.67 0.81 1,525/- 25.03/-  
  Number Percentage   Number Percentage  
Case only  
   All cases 1,257 /   2,215 /  
   ER-positive 684 81.92   1,709 80.92  
   ER-negative 151 18.08   403 19.08  
   Controls 1,464 /   1265 /  
  1. Data presented as cases/controls. BMI, body mass index; ER, estrogen receptor. aTwo-sided t test was used for P value estimation.