Table 5. Summary of pre-intervention CO concentrations stratified by household characteristics in rainy season (N = 2013).
| N (%) | Median overall CO conc. (IQR) (ppm) | Median SI CO conc. (IQR) (ppm) | Median non-SI CO conc. (IQR) (ppm) | |
|---|---|---|---|---|
| Rainy season | ||||
| Fuel type | ||||
| Wood | 257 (13) | 8.8 (4.8, 16.2) | 16.8 (9.5, 32.2) | 1.6 (0.7, 3.9) |
| Dung/wood | 196 (10) | 8.2 (5.2, 14.6) | 17.0 (9.0, 28.7) | 1.7 (0.7, 3.9) |
| Crop waste | 118 (6) | 8.7 (4.3, 15.6) | 19.1 (8.6, 34.9) | 1.7 (0.7, 2.9) |
| Wood/dung/crop waste | 105 (5) | 8.9 (5.0, 14.3) | 20.0 (11.6, 34.3) | 1.8 (0.8, 3.0) |
| Presence of external opening | ||||
| No | 170 (10) | 8.3 (4.5, 15.1) | 17.1 (9.0, 30.1) | 1.6 (0.7, 3.8) |
| Yes | 414 (25) | 8.5 (5.0, 15.4) | 18.3 (9.5, 32.4) | 1.7 (0.6, 3.1) |
| Roof material | ||||
| Cement | 45 (2) | 8.9 (5.6, 13.4) | 16.3 (10.5, 30.3) | 1.5 (0.7, 2.9) |
| Tile or tin | 559 (28) | 8.1 (4.7, 14.8) | 16.8 (9.2, 30.0) | 1.7 (0.7, 3.4) |
| Plastic, thatch or grass | 72 (4) | 12.3 (5.8, 19.4) | 26.7 (15.3, 42.1) | 1.8 (0.7, 4.2) |
| Kitchen wall material | ||||
| Brick or stone with mortar | 176 (9) | 9.2 (5.7, 16.5) | 20.2 (11.6, 34.6) | 1.7 (0.7, 2.7) |
| Bamboo with mud plaster or wood planks | 472 (24) | 7.9 (4.6, 15.0) | 16.9 (9.1, 31.0) | 1.7 (0.7, 3.6) |
| Thatch, grass or branches without mud | 11 (1) | 8.9 (4.9, 16.2) | 16.2 (8.7, 34.1) | 2.1 (1.7, 4.3) |
| Dry season | ||||
| Fuel type | ||||
| Wood | 544 (27) | 8.2 (4.6, 14.5) | 16.6 (8.7, 27.7) | 0.8 (0.6, 1.7) |
| Dung/wood | 173 (9) | 8.8 (5.0, 16.8) | 16.9 (9.6, 35.0) | 1.1 (0.6, 2.2) |
| Crop waste | 463 (23) | 6.8 (3.9, 12.8) | 14.6 (7.6, 26.9) | 0.7 (0.6, 1.5) |
| Wood/dung/crop waste | 157 (8) | 9.3 (5.7, 13.4) | 18.5 (11.0, 29.6) | 1.2 (0.6, 2.2) |
| Presence of external opening | ||||
| No | 377 (22) | 8.0 (4.7, 14.2) | 15.9 (9.5, 27.0) | 0.7 (0.6, 1.6) |
| Yes | 716 (43) | 7.5 (4.1, 13.5) | 15.6 (8.1, 27.1) | 0.8 (0.6, 1.9) |
| Roof material | ||||
| Cement | 57 (3) | 7.3 (4.5, 17.4) | 14.3 (7.1, 31.6) | 1.0 (0.6, 2.7) |
| Tile or tin | 1145 (57) | 7.9 (4.3, 14.1) | 15.9 (8.5, 28.0) | 0.8 (0.6, 1.8) |
| Plastic, thatch or grass | 134 (7) | 9.3 (4.9, 14.6) | 19.7 (10.3, 28.0) | 0.7 (0.6, 1.7) |
| Kitchen wall material | ||||
| Brick or stone with mortar | 314 (16) | 9.4 (5.3, 15.1) | 18.0 (10.4, 31.1) | 1.0 (0.6, 2.0) |
| Bamboo with mud plaster or wood planks | 939 (48) | 7.6 (4.1, 13.6) | 15.4 (8.0, 26.8) | 0.8 (0.6, 1.6) |
| Thatch, grass or branches without mud | 39 (2) | 8.1 (5.1, 20.9) | 17.4 (10.7, 40.9) | 1.8 (0.6, 2.7) |