Sensitivity (95% CI) | Specificity (95% CI) | PPV (95% CI) | NPV (95% CI) | LR+ (95% CI) | LR− (95% CI) | |
---|---|---|---|---|---|---|
Abdominal distension (n=148) | 74 (62 to 84) | 44 (32 to 55) | 54 (44 to 64) | 65 (51 to 78) | 1.3 (1.0 to 1.7) | 0.6 (0.4 to 1.0) |
Feel of abdomen (n=117) | 11 (4 to 24) | 97 (90 to 100) | 71 (29 to 95) | 63 (53 to 72) | 3.9 (0.8 to 19) | 0.9 (0.8 to 1.0) |
Abdominal tenderness (n=68) | 62 (44 to 78) | 68 (49 to 83) | 66 (47 to 81) | 64 (46 to 79) | 1.9 (1.1 to 3.3) | 0.6 (0.4 to 0.9) |
Abnormal AXR findings (n=143) | 97 (90 to 99) | 14 (7 to 24) | 50 (41 to 59) | 85 (55 to 98) | 1.1 (1.0 to 1.3) | 0.2 (0.1 to 0.9) |
Sensitivity, specificity, PPV and NPV are given as percentages and 95% CI are given in brackets.