Table 3—

Cumulative incidence of respiratory symptoms and sensitisation and asthma score by occupational class and education level between European Community Respiratory Health Survey I(1991–1992) and II (1999–2001)#

VariableOccupational classEducation
IIIIIIIV–VVIp-value+HighMediumLowp-value+
Asthma symptom
 Breathless while wheezing in previous 12 months1.41.11.41.60.5<0.0011.51.62.90.004
 Waking with chest tightness in previous 12 months2.51.62.31.80.80.3062.32.53.90.032
 Attack of shortness of breath at rest in previous 12 months0.90.61.10.60.40.1411.01.01.60.248
 Attack of shortness of breath after exercise in previous 12 months3.92.54.53.21.20.0013.64.27.3<0.001
 Waking due to attack of shortness of breath in previous 12 months0.90.71.00.60.40.0710.91.31.60.345
 Asthma ever1.00.81.00.70.30.5531.11.21.70.428
 Asthma score mean0.240.360.360.350.38<0.001§0.280.290.38<0.001§
 Asthma1.31.01.50.90.50.0621.21.72.40.087
Other symptoms
 Bronchitis0.20.30.40.30.20.1480.20.50.70.008
Sensitisation
 Dermatophagoides pteronyssinus4.42.52.82.81.10.0093.94.64.60.028
 Cat2.11.51.51.20.40.1862.02.22.30.308
 Grass4.42.93.42.70.90.2654.54.55.00.034
 Cladosporium herbarium0.30.10.10.20.040.5090.20.20.30.592
  • Data are presented as % of new cases, unless otherwise stated. #: Only subjects with serum immunoglobulin E measurements were included (except bronchitis category); : I for managers and professionals, II for technicians and associate professionals, III for other nonmanual workes, IV for skilled manual workers, V for semi-skilled/unskilled manual workers and VI for unclassifiable/unknown; +: from Chi-squared test for association with categorical variables; §: p-value from likelihood ratio test for asthma score.