Table 1

 Characteristics of nursing and healthcare workers and a referent population of professional and/or administrative ECRHS II participants who were symptom-free at the baseline ECRHS I survey, and the percentage of each population with new-onset asthma

CharacteristicNursing populationReferent population
nNew-onset asthma n (row %)nNew-onset asthma n (row %)
Total33220 (6.0%)2481131 (5.3%)
Age (years)
    27.7 to <36.6937 (7.5%)60932 (5.3%)
    ⩾36.6 to <42.9875 (5.8%)61736 (5.8%)
    ⩾42.9 to <48.9966 (6.3%)60926 (4.3%)
    ⩾48.9 to 55.8562 (3.6%)64637 (5.7%)
Sex
    Female28918 (6.2%)142077 (5.4%)
    Male432 (4.7%)106154 (5.1%)
Smoking status at ECRHS II
    Lifetime non-smoker1438 (5.6%)114258 (5.1%)
    Ex-smoker1016 (5.9%)68333 (4.8%)
    Current Smoker886 (6.8%)65640 (6.1%)