Performance of the prognostic model in workers with a low probability of sensitisation at baseline. Results of the use of IgE serology in two groups of workers with a low (cut-off <2.5 points) and a high (cut-off ⩾2.5 points) risk of becoming sensitised after three years
| Sumscores from questionnaire | Cut-off | <2.5 points | ⩾2.5 points | ||
|---|---|---|---|---|---|
| Predicted probability of sensitisation* | 0.07 (0.02) | 0.22 (0.08) | |||
| Observed sensitisation rate | 0.06 (10/180) | 0.24 (24/102)† | |||
| IgE serology | Pos | Neg | Pos | Neg | |
|---|---|---|---|---|---|
| *Mean (SD). | |||||
| †One case missing values for IgE serology. | |||||
| Additional IgE serology | Predicted probability of sensitisation* | 0.16 (0.08) | 0.04 (0.01) | 0.37 (0.18) | 0.10 (0.03) |
| Observed sensitisation rate | 0.14 (6/42) | 0.03 (4/138) | 0.39 (17/44) | 0.12 (7/57) | |