Table 3.
Odds ratios (OR) and 95% confidence intervals (CIs) for asthma occurrence according to the level of greenness exposure in preschool children (0–5 years old).
| Greenness Exposure | Model 1 | Model 2 | ||
|---|---|---|---|---|
| OR (95% CI) | p-Value | OR (95% CI) | p-Value | |
| 0–20% | Reference | Reference | ||
| 21–40% | 1.18 (1.04–1.33) | 0.0106 | 1.18 (1.04–1.33) | 0.0107 |
| 41–60% | 1.28 (1.10–1.50) | 0.0017 | 1.29 (1.11–1.50) | 0.0012 |
| 61–80% | 1.31 (1.10–1.57) | 0.0031 | 1.33 (1.11–1.60) | 0.0017 |
| 81–100% | 1.07 (0.86–1.33) | 0.5464 | 1.09 (0.88–1.34) | 0.4470 |
| p for trend | 0.1180 | 0.0828 | ||
Model 1 was adjusted for urbanization level, frequency of healthcare provider visits, mean township family income, CO, and PM2.5; Model 2 was adjusted for urbanization level, frequency of healthcare provider visits, mean township family income, NO2, and PM2.5. The OR and 95% CI values were estimated using a conditional logistic regression model. The p-trends were calculated using the continuous scale of the level of greenness exposure in the corresponding models.