Egg | Milk | Peanut | Soya | Wheat | Fish | |
---|---|---|---|---|---|---|
PPV, positive predictive value of >3 mm skin test correctly predicting symptoms on food challenge; NPV, negative predictive value of a skin test <3 mm correctly predicting no symptoms on blind food challenge. Adapted from Sampson and Ho.4 | ||||||
Numbers +/– | 90/34 | 53/53 | 20/21 | 29/78 | 19/65 | 11/7 |
Predictive value from study population | ||||||
PPV | 85 | 66 | 55 | 35 | 35 | 77 |
NPV | 90 | 93 | 75 | 84 | 94 | 80 |
Predictive value based on hypothetical population with 10% food allergy prevalence | ||||||
PPV | 17 | 2 | 15 | 12 | 15 | 30 |
NPV | 99 | 100 | 99 | 97 | 98 | 99 |