Table 2.
Household and wood stove characteristics at baseline (Winter 1).
| All households (Total n = 144) |
Placebo (Total n = 45) |
Filtration (Total n = 46) |
Education (Total n = 47) |
|
|---|---|---|---|---|
|
| ||||
| Levels in home | ||||
| 1, n (%) | 128 (89) | 41 (91) | 42 (91) | 39 (83) |
| 2+, n (%) | 16 (11) | 4 (9) | 4 (9) | 8 (17) |
| Home square meters | ||||
| <111 (median), n (%) | 78 (54) | 21 (47) | 27 (59) | 27 (57) |
| 111+, n (%) | 66 (46) | 24 (53) | 19 (41) | 20 (43) |
| Household income | ||||
| Less than $20,000, n (%) | 88 (61) | 27 (60) | 26 (57) | 30 (64) |
| $20,000–$39,999, n (%) | 37 (26) | 10 (22) | 13 (28) | 13 (28) |
| $40,000+, n (%) | 19 (13) | 8 (18) | 7 (15) | 4 (9) |
| Year home was built | ||||
| <1981 (median), n (%) | 75 (52) | 25 (56) | 22 (48) | 26 (55) |
| ≥1981, n (%) | 69 (48) | 20 (44) | 24 (52) | 21 (45) |
| Pets in home | ||||
| 0, n (%) | 80 (56) | 25 (56) | 29 (63) | 23 (49) |
| 1, n (%) | 25 (17) | 7 (16) | 9 (20) | 6 (13) |
| 2+, n (%) | 39 (27) | 13 (29) | 8 (17) | 18 (38) |
| Household resident smokes | ||||
| Yes, n (%) | 48 (33) | 17 (38) | 14 (30) | 16 (34) |
| No, n (%) | 95 (66) | 28 (62) | 32 (70) | 30 (64) |
| Household resident smokes inside | ||||
| Yes, n (%) | 12 (8) | 2 (4) | 4 (9) | 6 (13) |
| No, n (%) | 122 (85) | 41 (91) | 36 (78) | 40 (85) |
| Age of stove | ||||
| <6 years, n (%) | 26 (18) | 10 (22) | 7 (15) | 7 (15) |
| 6 to 10 years, n (%) | 27 (19) | 9 (20) | 11 (24) | 7 (15) |
| 11 to 15 years, n (%) | 11 (8) | 3 (7) | 4 (9) | 4 (9) |
| 16+ years, n (%) | 80 (56) | 23 (51) | 24 (52) | 29 (62) |
| EPA certified stove | ||||
| Yes, n (%) | 18 (13) | 7 (16) | 5 (11) | 6 (13) |
| No, n (%) | 47 (33) | 14 (31) | 18 (39) | 15 (32) |
| Do not know, n (%) | 79 (55) | 24 (53) | 23 (50) | 26 (55) |
| Chimney last cleaned | ||||
| <6 months, n (%) | 64 (44) | 22 (49) | 23 (50) | 16 (34) |
| 6 to 12 months, n (%) | 27 (19) | 10 (22) | 5 (11) | 11 (23) |
| 12 to 18 months, n (%) | 17 (12) | 4 (9) | 4 (9) | 8 (17) |
| 18+ months, n (%) | 36 (25) | 9 (20) | 14 (30) | 12 (26) |
| Self-reported relative burn level during PM2.5 sampling | ||||
| Light burning, n (%) | 29 (20) | 8 (18) | 9 (20) | 10 (21) |
| Average burning, n (%) | 86 (60) | 25 (56) | 31 (67) | 27 (57) |
| Heavy burning, n (%) | 29 (20) | 12 (27) | 6 (13) | 10 (21) |
| Primary wood collection method | ||||
| Harvest yourself, n (%) | 36 (25) | 14 (31) | 10 (22) | 11 (23) |
| Purchase, n (%) | 41 (28) | 11 (24) | 15 (33) | 14 (30) |
| Delivery program, n (%) | 65 (45) | 19 (42) | 21 (46) | 21 (45) |
| Other, n (%) | 2 (1) | 1 (2) | 0 (0) | 1 (2) |
| Wood collection before burning | ||||
| <1 week, n (%) | 20 (14) | 5 (11) | 6 (13) | 9 (19) |
| 1 week to 1 month, n (%) | 36 (25) | 10 (22) | 14 (30) | 10 (21) |
| 1 to 3 months, n (%) | 41 (28) | 15 (33) | 9 (20) | 14 (30) |
| 3 to 6 months, n (%) | 21 (15) | 5 (11) | 7 (15) | 8 (17) |
| 6 months to 1 year, n (%) | 14 (10) | 8 (18) | 4 (9) | 2 (4) |
| 1 year+, n (%) | 12 (8) | 2 (4) | 6 (13) | 4 (9) |
| Wood stove grade | ||||
| High-quality, n (%) | 14 (10) | 3 (7) | 4 (9) | 6 (13) |
| Medium-quality, n (%) | 67 (47) | 21 (47) | 22 (48) | 22 (47) |
| Low-quality, n (%) | 46 (32) | 16 (36) | 15 (33) | 13 (28) |
n = number of homes or observations; sd = standard deviation; min = minimum; max = maximum; PM2.5 = fine particulate matter; AI/AN = American Indian/Alaska Native; EPA = United States Environmental Protection Agency.