NO2 | PM2.5 | Soot | |||||||
n | β*IQR | se*IQR | n | β*IQR | se*IQR | n | β*IQR | se*IQR | |
Model 2 (main model) | 765 | 0.0245* | 0.0123 | 765 | 0.0399* | 0.0150 | 765 | 0.0337* | 0.0132 |
Model 2 + intervention | 765 | 0.0246* | 0.0123 | 765 | 0.0403* | 0.0151 | 765 | 0.0339* | 0.0132 |
Model 2 + cough on test day | 765 | 0.0227# | 0.0124 | 765 | 0.0379* | 0.0151 | 765 | 0.0318* | 0.0132 |
Model 2 + technician Rint | 765 | 0.0283 | 0.0184 | 765 | 0.0432# | 0.0247 | 765 | 0.0376# | 0.0198 |
Model 2 + region of the country | 765 | 0.0248 | 0.0192 | 765 | 0.0400 | 0.0271 | 765 | 0.0368# | 0.0210 |
Change in Rint (kPa.s.L−1) calculated by multiplying regression slope (β) from multiple linear regression with IQRs (table 2). Model 2: corrected for age, sex, height, nationality, siblings, mother smoking during pregnancy, pets, mould/damp spots, smoking inside child's home, use of gas for cooking, geyser without outlet, parental allergy and education of parents, temperature, relative humidity and season. PM2.5: particles with a diameter of <2.5 μm. *: p<0.05; #: p<0.10.