Table 2

 Diagnostic performance (with 95% CI) of pain over speed bumps compared with other clinical diagnostic variables for appendicitis

Diagnostic variableSensitivity (%)Specificity (%)Positive predictive value (%)Negative predictive value (%)Positive likelihood ratioNegative likelihood ratio
Pain over speed bumps97 (85 to 100)30 (15 to 49)61 (47 to 74)90 (56 to 100)1.4 (1.1 to 1.8)0.1 (0.0 to 0.7)
Migratory pain65 (46 to 80)33 (17 to 53)52 (36 to 68)45 (24 to 68)1.0 (0.7 to 1.4)1.1 (0.5 to 2.1)
Nausea or vomiting79 (62 to 91)17 (5.6 to 35)52 (38 to 66)42 (15 to 72)1.0 (0.8 to 1.2)1.2 (0.4 to 3.5)
Rebound tenderness71 (53 to 85)50 (31 to 69)62 (45 to 77)60 (39 to 79)1.4 (0.9 to 2.2)0.6 (0.3 to 1.1)