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Table 4 Validation of the menstrual status definition according to questionnaire information

From: Hormone replacement therapy use and plasma levels of sex hormones in the Norwegian Women and Cancer Postgenome Cohort – a cross-sectional analysis

  Classification according to plasma E2 and FSH levels
  Post- Pre- Total
Classification according to two-page questionnaire    
   Post- 240 27 267
   Pre- 20 72 92
   Total 260 99 359
Sensitivity: 240/260 = 92% (95% CI 89–96%)    
Specificity: 72/99 = 73% (95% CI 64–82%)    
Classification according to eight-page questionnaire    
   Post- 229 11 240
   Pre- 29 86 115
   Unknown 2 2 4
   Total 260 99 359
Sensitivity: 229/260 = 88% (95% CI 84–92%)    
Specificity: 86/99 = 87% (95% CI 80–94%)