Table 4.
Second-stage of IV estimation: Effects of air pollutants on cognitive function.
| Variables | β coefficient | 95% CI |
|---|---|---|
| PM1 (IQR = 10. 60 μg/m3) | − 0. 45 | (− 0. 76, − 0. 13)** |
| PM2.5 (IQR = 21. 11 μg/m3) | − 0. 43 | (− 0. 74, − 0. 13)** |
| PM10 (IQR = 47. 28 μg/m3) | − 0. 53 | (− 0. 90, − 0. 16)** |
| NO2 (IQR = 14. 77 μg/m3) | − 0. 57 | (− 0. 96, − 0. 17)** |
| SO2 (IQR = 8. 66 μg/m3) | − 0. 47 | (− 0. 80, − 0. 14)** |
| O3 (IQR = 19. 35 μg/m3) | − 1. 06 | (− 1. 81, − 0. 31)** |
IQR: interquartile range; PM1: particulate matter with aerodynamic diameter ≤ 1 µm; PM2.5: particulate matter with aerodynamic diameter ≤ 2.5 µm; PM10: particulate matter with aerodynamic diameter ≤ 10 µm; NO2: nitrogen dioxide; SO2: sulfur dioxide; O3: ozone.
***p < 0. 001,
**p < 0. 01,
*p < 0. 05. 95% confidence interval in parentheses based on robust standard error. All modes adjusted for sociodemographic characteristics (age, gender, living area, marital status, education level, regional category, family residence), lifestyle habits and health (smoking status, drink status, cooking fuel use, number of chronic diseases), and meteorological conditions (average temperature, relative humidity).