Pollutant descriptive statistics and correlation matrix#
| Subjects n | Mean±sd μg·m−3 | Minimum μg·m−3 | Maximum μg·m−3 | IQR μg·m−3 | Pearson correlation coefficients | ||||
| PM2.5 | PM10 | PMcoarse | NO2 | ||||||
| PM2.5 | 278 228 | 9.94±1.04 | 8.17 | 19.89 | 1.27 | 1 | 0.53 | 0.21 | 0.87 |
| PM10 | 278 228 | 16.18±1.90 | 11.78 | 31.39 | 1.77 | 1 | 0.81 | 0.50 | |
| PMcoarse | 278 228 | 6.41±0.90 | 5.57 | 12.82 | 0.77 | 1 | 0.19 | ||
| NO2 | 299 537 | 26.31±7.49 | 12.93 | 108.49 | 9.70 | 1 | |||
IQR: interquartile range; PM2.5: fine particulate matter with a 50% cut-off aerodynamic diameter <2.5 μm; PM10: particulate matter with a 50% cut-off aerodynamic diameter <10 μm; PMcoarse: coarse particulate matter with diameter 2.5–10 μm; NO2: nitrogen dioxide. #: descriptive statics shown are for participants with complete data for forced expiratory volume in 1 s, forced vital capacity, age, sex, body mass index, education level, household income, smoking status and passive smoking exposure at home.