Table 5

Performance of the decision rule (mean predicted probability and observed prevalence of laboratory animal sensitisation relative to the number of risk factors derived from a questionnaire (step 1), and results from SPTs to common allergens in step 2)

No risk factors1 Risk factor2–3 Risk factors≥4 Risk factors
Initial survey (questionnaire results):
    Observed prevalence
 of sensitisation:
    Predicted probability
 of sensitisation:
        SD1 1 1 1
Second survey (SPT results):
    Skin prick testPosNegPosNeg
    Observed prevalence
 of sensitisation:
    Mean predicted