Demographic data on workers and records included in the analysis
| OA positive (101 records from 84 workers) | OA negative (188 records from 173 patients) | p Value | |
| Mean (SD) age (years) | 46.1 (9.7) | 51.1 (9.6) | <0.001 |
| % male | 49.2 | 60.1 | 0.136 |
| % atopic | 56.1 | 50.0 | 0.431 |
| % current smokers | 20.0 | 20.0 | 0.874 |
| % methacholine reactive (<2000 μg) | 72.5 | 40.9 | <0.005 |
| % taking ICS | 77.1 | 83.9 | 0.284 |
| Mean (SD) FEV1 (% predicted) | 80.3 (27.0) | 84.6 (22.4) | 0.950 |
| Mean (SD) diurnal PEF variation (l/min) | 23.4 (14.3) | 16.8 (11.7) | 0.116 |
| Mean (SD) ABC from waking time (l/min/h) | 30.7 (32.3) | −0.4 (6.5) | <0.001 |
| Mean (SD) number of rest days | 14.2 (7.8) | 13.9 (12.0) | 0.816 |
| Mean (SD) number of day shift days | 16.4 (9.6) | 15.1 (11.5) | 0.087 |
| Mean (SD) number of readings per day | 7.1 (1.8) | 6.7 (2.5) | 0.135 |
| Mean (SD) Oasys-2 score | 3.0 (0.8) | 1.3 (0.9) | <0.001 |
| Mean (SD) work day–rest day PEF | 27.9 (31.0) | −0.2 (5.8) | <0.001 |
The denominator is the number of workers for the personal data and the number of records for the peak flow data.
ABC, area between curves; FEV1, forced expiratory volume in 1 s; ICS, inhaled corticosteroids; OA, occupational asthma; PEF, peak expiratory flow.