Table 3.
Mean fine particulate matter concentrations, wood moisture content, and wood stove temperature during pre- and post-intervention winters.
| All households (Total n = 144) |
Placebo (Total n = 45) |
Filtration (Total n = 46) |
Education (Total n = 47) |
|
|---|---|---|---|---|
|
| ||||
| Mean indoor PM2.5 concentration during (μg/m3) | ||||
| Winter 1 | ||||
| n | 138 | 42 | 46 | 44 |
| mean (sd) | 41.6 (59.9) | 49.0 (65.4) | 41.6 (74.3) | 35.4 (35.9) |
| min, median, max | 3.6, 23.6, 507.0 | 3.6, 25.5, 310.8 | 4.9, 27.9, 507.0 | 5.9, 23.1, 171.6 |
| Winter 2 | ||||
| n | 123 | 41 | 39 | 43 |
| mean (sd) | 37.1 (41.8) | 41.6 (39.2) | 30.5 (51.5) | 38.8 (33.9) |
| min, median, max | 1.1, 19.2, 194.3 | 5.6, 30.1, 162.2 | 1.1, 12.1, 194.3 | 3.7, 23.6, 136.6 |
| Mean personal PM2.5 concentration (μg/m3); NPT participants only | ||||
| Winter 1 | ||||
| n | 66 | 20 | 22 | 21 |
| mean (sd) | 29.8 (48.7) | 39.0 (49.0) | 33.9 (67.8) | 17.8 (17.2) |
| min, median, max | 2.9, 15.7, 320.0 | 3.5, 25.5, 228.1 | 2.9, 12.0, 320.0 | 3.8, 10.2, 70.8 |
| Winter 2 | ||||
| n | 61 | 19 | 22 | 20 |
| mean (sd) | 23.7 (27.0) | 29.2 (22.3) | 23.1 (34.5) | 19.0 (21.6) |
| min, median, max | 2.2, 10.8, 128.2 | 5.8, 24.5, 75.4 | 2.5, 8.6, 128.2 | 2.2, 10.6, 70.3 |
| Wood moisture content (%) | ||||
| Winter 1 | ||||
| n | 127 | 39 | 41 | 41 |
| mean (sd) | 12.5 (4.6) | 12.1 (4.4) | 12.9 (4.4) | 12.3 (4.2) |
| min, median, max | 5.0, 12.5, 32.0 | 5.0, 12.2, 27.2 | 5.0, 12.5, 24.6 | 5.0, 12.7, 19.6 |
| Winter 2 | ||||
| n | 127 | 43 | 41 | 43 |
| mean (sd) | 12.0 (3.9) | 11.7 (4.1) | 12.3 (3.7) | 11.9 (3.9) |
| min, median, max | 5.0, 11.5, 21.5 | 5.9, 10.8, 21.5 | 5.1, 11.9, 19.2 | 5.0, 11.8, 19.5 |
| Wood stove temperature monitor (degrees Celsius) | ||||
| Winter 1 | ||||
| n | 131 | 38 | 44 | 43 |
| mean (sd) | 26.9 (6.1) | 26.7 (5.4) | 28.0 (6.8) | 26.1 (6.3) |
| min, median, max | 7.6, 26.3, 48.2 | 14.8, 26.4, 41.3 | 14.7, 26.5, 47.9 | 7.6, 25.5, 48.2 |
| Winter 2 | ||||
| n | 107 | 35 | 35 | 37 |
| mean (sd) | 26.4 (5.8) | 26.2 (5.6) | 27.4 (6.4) | 25.7 (5.4) |
| min, median, max | 7.6, 25.3, 52.8 | 14.8, 25.2, 43.9 | 13.9, 26.2, 52.8 | 7.6, 25.1, 35.9 |
n = number of homes or observations; sd = standard deviation; min = minimum; max = maximum; PM2.5 = fine particulate matter; NPT = Nez Perce Tribe study area.