Table 4—

Associations of recent respiratory disorders with indoor concentrations of particulate matter(PM10) and CO2

Conventional regression modelsTwo-level# regression model
Crude OR (95% CI)Adjusted OR (95% CI)Adjusted OR (95% CI)
PM10 per 10 μg·m−3 increment
 Wheeze1.00 (0.96–1.03)1.00 (0.95–1.05)1.00 (0.95–1.05)
 Dry cough at night1.04 (1.01–1.06)**1.00 (0.97–1.04)0.99 (0.93–1.05)
 Rhinitis1.00 (0.97–1.02)0.97 (0.94–1.01)0.97 (0.92–1.02)
CO2 per 100 ppm increment
 Wheeze1.00 (0.96–1.03)0.99 (0.94–1.04)1.00 (0.95–1.05)
 Dry cough at night1.06 (1.03–1.09)***1.05 (1.01–1.09)**1.06 (1.00–1.13)*
 Rhinitis1.03 (1.01–1.06)**1.05 (1.02–1.09)**1.06 (1.00–1.11)*
  • #: first level, child; second level, classroom. : in the models: PM10 and CO2 concentration, passive exposure to tobacco smoking at home, sex, age. *: p<0.05; **: p<0.01; ***: p<0.001.