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Table 4 Sensitivity and specificity of the FTFI method compared to the SEM method for identifying cases of forced sex

From: Methods to increase reporting of childhood sexual abuse in surveys: the sensitivity and specificity of face-to-face interviews versus a sealed envelope method in Ugandan primary school children

  SEMb  
FTFIa Affirmative Negative Total
 Affirmative 35 (0.9%) 7 (0.2%) 42 (1.1%)
 Negative 233 (6.1%) 3568 (92.8%) 3801 (98.9%)
Total 268 (7.0%) 3575 (93.0%) 3,843  
Sensitivity and Specificity Analysis:
   95% CI
Prevalence 7.0% (6.2%, 7.8%)
Sensitivity 13.1% (9.3%, 17.7%)
Specificity 99.8% (99.6%, 99.9%)
Positive Likelihood Ratio 66.7 (29.9, 149.0)
Negative Likelihood Ratio 0.87 (0.83, 0.91)
  1. a FTFI face-to-face interview method
  2. b SEM sealed envelope method, assumed ‘gold standard’ mode of data collection