Table 2

Characteristics of the study population and prevalence (%) estimates of work-related asthma symptoms, work-exacerbated asthma and occupational asthma in health care professionals

VariablesAll, n (%)*Work-related asthma symptoms, n (%)*Work-exacerbated asthma, n (%)*Occupational asthma, n (%)*
n (%)3650132 (3.3)41 (1.1)33 (0.8)
Age in years (mean, SD)45.3 (3.4)44.3 (9.4)43.5 (11.3)46.3 (9.3)
 First quartile (mean 31.0 years)891 (17.8)30 (4.2)11 (1.3)5 (0.5)
 Second quartile (mean 40.6 years)891 (21.3)30 (2.4)13 (1.1)9 (0.3)
 Third quartile (mean 48.5 years)892 (27.6)39 (3.5)11 (0.8)10 (1.2)
 Fourth quartile (mean 61.1 years)890 (31.0)28 (2.6)6 (1.3)9 (0.8)
Sex
 Male1153 (22.3)31 (1.8)9 (0.3)3 (0.1)
 Female2437 (76.1)99 (3.6)32 (1.3)30 (1.0)
Ethnicity
 Non-Hispanic white2544 (71.1)80 (2.8)33 (1.4)20 (0.7)
 Non-Hispanic blacks218 (6.2)14 (5.8)2 (1.3)3 (0.2)
 Hispanic519 (12.1)26 (4.7)6 (0.2)8 (1.5)
 Other316 (9.1)10 (2.3)02 (0.9)
Atopy
 No2906 (80.4)99 (2.8)20 (0.6)23 (0.6)
 Yes576 (14.7)32 (6.4)19 (3.3)8 (1.3)
Smoking status
 Non-smoker2387 (65.1)71 (2.6)26 (1.2)27 (0.9)
 Current smoker329 (9.1)24 (5.3)7 (0.3)1 (0.1)
 Ex-smoker884 (24.3)34 (4.0)8 (1.1)5 (0.7)
Body mass index
 Normal (<25.0)1608 (43.6)33 (1.9)9 (0.4)9 (0.5)
 Overweight (25.0–29.9)1202 (31.3)47 (2.9)18 (2.0)10 (0.6)
 Obese (30 and above)743 (22.3)48 (5.8)14 (1.3)14 (1.6)
Health care professionals
 Physicians862 (19.2)7 (0.8)6 (0.7)2 (0.2)
 Occupational therapists968 (3.1)25 (2.6)10 (1.0)12 (1.2)
 Nurses941 (73.4)35 (3.7)11 (1.2)8 (0.9)
 Respiratory therapists879 (4.4)65 (7.4)14 (1.6)11 (1.3)
  • * Weighted %, unweighted n.

  • Missing values in the variables were treated as a separate category during the analysis, instead of deleting them from the analysis.