Table 2.
Summary of cookstove performance in Study I comparing two alternative cookstoves to a traditional stove in a home setting in rural Nepal.
| Measure | Fuel | WBT or Background | Traditional | n | AMBS-I | n | Envirofit G-Series | n | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean (SD) a | Median (IQR) b | Mean (SD) a | Median (IQR) b | Mean (SD) a | Median (IQR) b | ||||||
| PM2.5 Concentration (μg/m3) | Wood | WBT c | 4584 (2769) | 3294 (2325–5137) | 23 | 1657 (859) | 1058 (513–1655) | 12 | 2414 (1191) | 1818 (1257–2383) | 9 |
| Background d | 148 (154) | 100 (33–204) | 83 (52) | 59 (7–103) | 217 (128) | 247 (106–299) | |||||
| Wood & Dung | WBT c | 5799 (2621) | 4220 (3605–5582) | 13 | 1317 (455) | 938 (425–985) | 6 | 3769 (3539) | 2115 (1196–2883) | 9 | |
| Background d | 119 (80) | 74 (63–182) | 51 (36) | 30 (21–73) | 199 (104) | 180 (133–231) | |||||
| Crop Waste | WBT c | 9766 (6788) | 6299 (3388–14,824) | 12 | 5442 (3241) | 4487 (3783–5345) | 5 | 4945 (2476) | 3838 (2680–5665) | 6 | |
| Background d | 172 (118) | 145 (52–213) | 120 (133) | 26 (21–65) | 295 (185) | 186 (148–277) | |||||
| Boiling Time (hours) | Wood | WBT | 0.69 (0.08) | 23 | 1.17 (0.12) | 12 | 1.47 (0.19) | 9 | |||
| Wood & Dung | WBT | 0.74 (0.09) | 13 | 1.17 (0.11) | 6 | 1.66 (0.38) | 9 | ||||
| Crop Waste | WBT | 0.80 (0.09) | 12 | 1.79 (0.22) | 5 | 1.67 (0.30) | 6 | ||||
| Fuel Use (kg) | Wood | WBT | 2.35 (0.33) | 23 | 3.13 (0.50) | 12 | 2.97 (0.38) | 9 | |||
| Wood and Dung | WBT | 2.47 (0.48) | 13 | 2.77 (0.44) | 6 | 2.70 (0.48) | 9 | ||||
| Crop Waste | WBT | 2.51 (0.46) | 12 | 3.89 (0.58) | 5 | 2.60 (1.09) | 6 | ||||
Abbreviations: WBT is Water Boiling Test; IQR is interquartile range; SD is standard deviation; AMBS-I is alternative mud brick stove (Version I). a This summary measure was calculated from water boiling test means or background measurement means (See the column “WBT or Background”); b This summary measure was calculated from water boiling test medians or the background measurement medians (See the column “WBT or Background”); c For WBT PM2.5, the background PM2.5 was subtracted from the PM2.5 measured during the water boiling test. The summary measure was calculated according to stove and fuel categories listed in the table; d Background PM2.5 was calculated from measurements taken during the 30-min period before the water boiling test began. The summary measure was calculated according to stove and fuel categories listed in the table.