Table 3.
Mean Differences in Lung Function for Each Stove Treatment Compared to Control at Each Measurement Time. Effect estimate is the difference in lung function value for the stove treatment compared to the control, accounting for baseline (pre-exposure).
| Treatment | Baseline value mean (SD)† | Effect Estimate (95% confidence interval) as compared to control* | ||
|---|---|---|---|---|
| Immediate post-exposure | 3 hours post-exposure | 24 hours post-exposure | ||
| FVC (ml) | Difference in FVC (ml) | |||
| LPG | 4854 (1024) | 5 (−69, 80) | −39 (−114, 35) | 9 (−74, 91) |
| gasifier | 4867 (1043) | 19 (−56, 93) | −21 (−95, 54) | 12 (−72, 96) |
| fan rocket | 4879 (1148) | −60 (−135, 15) | −30 (−105, 45) | 12 (−72, 95) |
| rocket elbow | 4898 (1064) | −40 (−114, 35) | −8 (−82, 67) | 1 (−83, 84) |
| three stone fire | 4860 (1070) | −42 (−116, 32) | −21 (−96, 53) | 26 (−56, 108) |
| FEV1 (ml) | Difference in FEV1 (ml) | |||
| LPG | 3860 (750) | 3 (−64, 69) | −68 (−128, −7) | 7 (−62, 76) |
| gasifier | 3873 (803) | 7 (−59, 74) | −53 (−114, 8) | −4 (−74, 66) |
| fan rocket | 3873 (852) | −51 (−117, 16) | −68 (−129, −7) | −15 (−84, 55) |
| rocket elbow | 3895 (816) | −24 (−91, 42) | −39 (−99, 22) | 0 (−69, 69) |
| three stone fire | 3887 (793) | −27 (−93, 39) | −39 (−99, 21) | −14 (−82, 54) |
| FEF25–75 (ml/s) | Difference in FEF25–75 (ml/s) | |||
| LPG | 3836 (987) | −44 (−167, 79) | −122 (−255, 11) | 39 (−78, 156) |
| gasifier | 3844 (1151) | −13 (−137, 110) | −74 (−208, 59) | −63 (−182, 56) |
| fan rocket | 3823 (1079) | −116 (−239, 8) | −114 (−249, 21) | −81 (−199, 37) |
| rocket elbow | 3862 (1148) | −68 (−191, 55) | −56 (−190, 77) | 35 (−83, 153) |
| three stone fire | 3915 (1126) | −103 (−225, 19) | −31 (−164, 102) | −88 (−204, 27) |
| FEV1/FVC (%) | Difference in FEV1/FVC (%) | |||
| LPG | 79.8 (6.4) | 0.0 (−0.9, 0.8) | −0.8 (−1.7, 0.2) | 0.0 (−0.9, 0.9) |
| gasifier | 79.4 (5.8) | −0.3 (−1.2, 0.6) | −0.9 (−1.9, 0.0) | 0.0 (−1.0, 0.9) |
| fan rocket | 79.4 (6.7) | −0.1 (−1.0, 0.7) | −0.5 (−1.4, 0.5) | −0.4 (−1.3, 0.5) |
| rocket elbow | 79.4 (6.4) | −0.2 (−1.0, 0.7) | −0.6 (−1.6, 0.3) | 0.2 (−0.8, 1.1) |
| three stone fire | 79.7 (6.8) | 0.5 (−0.4, 1.4) | 0.2 (−0.8, 1.1) | −0.2 (−1.1, 0.7) |
*
All estimates are adjusted for baseline (pre-exposure) values.
†
Control value at baseline [mean(SD)]: FVC: 4875 (1081) mL; FEV1: 3864 (787) mL; FEV1/FVC ratio: 79.4 (6.6)%; FEF25–75: 3832 (1101) mL/s.