Table 3.
Household PM2·5 concentrations by trial group over time
| Usual services group (n=601) | Smoke-free-home intervention only group (n=560) | Smoke-free-home intervention plus indoor-air-quality feedback group (n=640) | Total (n=1801) | |
|---|---|---|---|---|
| Baseline (as randomised) | ||||
| Households, n | 572 | 542 | 632 | 1746 |
| Mean (SD) | 41·9 (38·5) | 39·5 (29·3) | 44·6 (43·7) | 42·2 (38·0) |
| Median (range) | 29 (2–251) | 30 (8–166) | 30 (1–422) | 30 (1–422) |
| Baseline (as analysed) | ||||
| Households, n | 447 | 419 | 480 | 1346 |
| Mean (SD) | 44·2 (40·8) | 42·1 (30·7) | 46·6 (42·3) | 44·4 (38·6) |
| Median (range) | 30 (2–251) | 34 (8–166) | 30 (5–334) | 31 (2–334) |
| 3 months | ||||
| Households, n | 450 | 420 | 480 | 1350 |
| Mean (SD) | 85·3 (86·8) | 75·6 (83·7) | 74·9 (76·9) | 78·6 (82·5) |
| Median (range) | 44·5 (1–417) | 38 (6–459) | 38 (1–353) | 39 (1–459) |
| 12 months | ||||
| Households, n | 441 | 405 | 468 | 1314 |
| Mean (SD) | 65·2 (44·7) | 68·9 (49·5) | 65·8 (39·6) | 66·5 (44·6) |
| Median (range) | 54 (11–340) | 57 (13–389) | 56 (14–244) | 55 (11–389) |
PM2·5 concentrations are in μg/m3. PM2·5=airborne particulate matter less than 2·5 microns in diameter.