Table 1.

Baseline and household characteristics of study participants in rural Peru.

Variable	Category	Intervention ($n=90$)		Control ($n=90$)
Household characteristics	—	—	—	—	—
Kitchen roof material [n (%)]	—	—	—	—	—
Corrugated metal roof	—	36	(40%)	37	(41%)
Natural/Light: straw, totora, reed, or similar		54	(60%)	53	(59%)
Kitchen door permanently open [n (%)]	—	13	(14%)	18	(20%)
Kitchen door not permanently open [n (%)]	—	77	(86%)	72	(80%)
Windows permanently open [n (%)]
	0	39	(43%)	33	(37%)
	1	14	(16%)	12	(13%)
	2	1	(1%)	6	(7%)
	5	0	(0%)	2	(2%)
Ventilation over biomass stove [n (%)]
Stove with no ventilation	—	30	(33%)	40	(44%)
Stove with chimney	—	7	(8%)	12	(13%)
Stove in recessed area	—	53	(59%)	38	(42%)
Most common fuels used for cooking [n (%)]
Alcohol/ethanol	—	23	(26%)	13	(14%)
Wood	—	37	(41%)	38	(42%)
Crop residue/grass/straw/bushes		61	(68%)	66	(73%)
Cow dung	—	90	(100%)	89	(99%)
Previously owned secondary stove [n (%)]
	None	26	(29%)	22	(24%)
	LPG gas	64	(71%)	68	(76%)
Electricity in household [n (%)]		85	(94%)	90	(100%)
No electricity in household [n (%)]		5	(6%)	0	(0%)
Participant characteristics
Highest level of education achieved [n (%)]
Without education or preschool only	—	4	(4%)	3	(3%)
Primary	—	53	(59%)	53	(59%)
Secondary	—	33	(37%)	34	(38%)
Non-university superior or university		0	(0%)	0	(0%)
Wealth quintile [n (%)]
	1	51	(57%)	50	(56%)
	2	32	(36%)	37	(41%)
	3	7	(8%)	3	(3%)
	4 and 5	0	(0%)	0	(0%)
Average years of education, mean (standard deviation)		6	3	6	3

Note: Data are complete for all observations. —, intentionally omitted.