Table 2.

Association of using solid fuel with symptoms of depression, CES-D-10 score, cognitive impairment, and cognitive scores.

	OR/β (95% CI)
Score of CES-D-10	Unadjusted model	mode I	model II	model III	model IV
Categorical variable (depression)*
Using clean fuel	Reference	Reference	Reference	Reference	Reference
Using solid fuel	1.37 (1.28, 1.40)	1.27 (1.21, 1.33)	1.15 (1.08, 1.22)	1.18 (1.11, 1.25)	1.09 (1.03, 1.16)
Continuous variable
Using clean fuel	Reference	Reference	Reference	Reference	Reference
Using solid fuel	0.77 (0.67, 0.86)	0.60 (0.50, 0.70)	0.38 (0.27, 0.49)	0.39 (0.27, 0.50) < 0.0001	0.23 (0.12, 0.35)
Cognitive score	Unadjusted model	mode I	model II	model III	model IV
Categorical variable (cognitive impairment)**
Using clean fuel	Reference	Reference	Reference	Reference	Reference
Using solid fuel	2.42 (2.27, 2.57)	2.14 (1.99, 2.30)	1.29 (1.18, 1.40)	1.27 (1.16, 1.38)	1.21 (1.11, 1.32)
Continuous variable
Using clean fuel	Reference	Reference	Reference	Reference	Reference
Using solid fuel	−3.80 (−3.96, −3.65)	−2.91 (−3.07, −2.76)	−0.78 (−0.93, −0.62)	−0.75 (−0.91, −0.60)	−0.63 (−0.79, −0.47)

CES-D-10, the Center for epidemiologic studies depression scale; OR, odds ratio; β, effect sizes; 95% CI, 95% confidence interval.

^*Depression was defined as CES-D-10 score over 10;

^**Cognitive impairment was identified as a cognitive score lower than 10 %; Model I: adjusted for age, gender, and BMI; Model II: adjusted for age, gender, BMI, education, marriage, live area, whether works, caste, religion, and economic status; Model III: adjusted for age, gender, BMI, education, marriage, live area, whether works, caste, religion, economic status, drinking, smoking, sleep disorder, CCDs, and vigorous physical activity; Model IV: adjusted for age, gender, BMI, education, marriage, live area, whether works, caste; religion, economic status, drinking, smoking, sleep disorder, CCDs, vigorous physical activity, other indoor pollution, and indicators of poor housing quality.