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Table 4 Performance of the low-cost tools

From: Does sequential balloon expulsion test improve the screening of defecation disorders?

Tool /performance measurement Sensitivity Specificity PPV NPV Accuracy
Abnormal (> 9 points) clinical DD score 65 10 31 33 31
Abnormal (≥ 2 points) Digital rectal examination 29 82 50 64 61
FV BET (standard) 86 58 57 86 69
VV BET 83 67 62 86 73
Sequential BET (VV » FV) 86 67 63 88 75
  1. DD defecation disorder, BET balloon expulsion test, VV variable volume, FV fixed volume, PPV positive predictive value, NPV negative predictive value