No risk factors | 1 Risk factor | 2–3 Risk factors | ≥4 Risk factors | |||
---|---|---|---|---|---|---|

Initial survey (questionnaire results): | ||||||

% | 20 | 41 | 33 | 7 | ||

n/N | 93/472 | 192/472 | 154/472 | 33/472 | ||

Observed prevalence of sensitisation: | ||||||

% | 13 | 13 | 44 | 76 | ||

n/N | 12/93 | 25/192 | 67/154 | 25/33 | ||

Predicted probability of sensitisation: | ||||||

% | 9 | 15 | 43 | 74 | ||

SD | 1 | 1 | 1 | 1 | ||

Second survey (SPT results): | ||||||

Skin prick test | Pos | Neg | Pos | Neg | ||

% | 55 | 45 | 79 | 21 | ||

n/N | 84/154 | 70/154 | 26/33 | 7/33 | ||

Observed prevalence of sensitisation: | ||||||

% | 66 | 17 | 77 | 71 | ||

n/N | 55/84 | 12/70 | 20/26 | 5/7 | ||

Mean predicted probability | ||||||

% | 62 | 19 | 83 | 43 | ||

SD | 2 | 1 | 2 | 1 |