. 2021 Jun 25;11:13304. doi: 10.1038/s41598-021-92452-0

Table 3.

Associations between solid fuels use for cooking and slef-reported sleep helath, stratified by age, sex and urbancity.

Outcomes	Consistent solid fuels use (reported in all surveys) vs. cleaner fuels use only
	Age 45–65	> 65 years	Interaction p value^b	Men	Women	Interaction p value^b	Rural area	Urban area	Interaction p value^b
	OR (95% CI)^a	OR (95% CI)^a	Interaction p value^b	OR (95% CI)^a	OR (95% CI)^a	Interaction p value^b	OR (95% CI)^a	OR (95% CI)^a	Interaction p value^b
Average hours of sleep at night
$<$ 6	1.14 (0.96, 1.36)	1.29 (0.98, 1.71)	0.50	1.19 (0.96, 1.47)	1.16 (0.95, 1.42)	0.74	1.27 (1.05, 1.52)	0.98 (0.75, 1.28)	0.09
6–7	0.96 (0.79, 1.16)	0.81 (0.59, 1.13)	0.15	0.83 (0.66, 1.04)	1.00 (0.79, 1.27)	0.11	0.94 (0.76, 1.16)	0.84 (0.63, 1.14)	0.53
7–9	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference
$>$ 9	1.09 (0.82, 1.45)	1.55 (1.04, 2.30)	0.38	1.39 (1.00, 1.94)	1.08 (0.79, 1.48)	0.22	1.16 (0.88, 1.52)	1.15 (0.75, 1.78)	0.96
The number of unrested days per week
$<$ 1	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference	Reference
1–2	1.15 (0.93, 1.42)	1.18 (0.84, 1.66)	0.65	1.22 (0.95, 1.58)	1.13 (0.87, 1.46)	0.35	1.28 (1.02, 1.62)	1.07 (0.76, 1.50)	0.27
3–4	1.33 (1.08, 1.64)	1.13 (0.79, 1.62)	0.36	1.30 (0.97, 1.73)	1.27 (1.00, 1.60)	0.65	1.30 (1.03, 1.63)	1.24 (0.90, 1.72)	0.75
5–7	1.20 (0.98, 1.45)	1.72 (1.26, 2.33)	0.25	1.12 (0.87, 1.43)	1.49 (1.19, 1.85)	0.13	1.26 (1.03, 1.55)	1.55 (1.16, 2.07)	0.26

^a According to consistent solid fuels use and adjusted for age, sex, education, marital status, household expenditure, active or passive smoking, urbanicity and cooking location within household.

^b P value was calculated using the product term between the exposure and the modifying variable.