Table 1.
Summary statistics for PM2.5 levels in the study groups and overall
| Intervention | Control | All | ||||
|---|---|---|---|---|---|---|
| 2nd trimester mean 72-h PM2.5 quartile | Median (min, max) |
n | Median (min, max) |
n | Median (min, max) |
n |
| Q1 | 20.3 (5.5–25.1) | 32 | 21.5 (12.8–26.6) | 26 | 20.6 (5.5–26.6) | 58 |
| Q2 | 32.3 (27–40.0) | 29 | 33.0 (27.0–40.5) | 29 | 32.9 (27.0–40.5) | 58 |
| Q3 | 52.5 (40.9–66.5) | 28 | 51.4 (41.3–67.6) | 30 | 51.8 (40.9–67.6) | 58 |
| Q4 | 166.3 (69.6–437.8) | 27 | 161.5 (69.6–437.8) | 31 | 162.6 (69.6–437.8) | 58 |
| 3rd trimester mean 72-h PM2.5 quartile | ||||||
| Q1 | 26.1 (0.7–32.3) | 28 | 22.0 (8.8–31.3) | 24 | 23.8 (0.7–32.3) | 52 |
| Q2 | 39.7 (32.7–48.2) | 26 | 40.9 (33.9–48.9) | 26 | 40.1 (32.7–48.9) | 52 |
| Q3 | 62.8 (49.2–106.8) | 27 | 71.5 (49.5–113.8) | 25 | 64.5 (49.2–113.8) | 52 |
| Q4 | 189.8 (122.2–890.5) | 24 | 186.3 (117.1–698.6) | 27 | 186.4 (117.0–890.5) | 51 |
n sample size; min minimum; max maximum