Association between biomass fuel use and the risk of cognitive impairment among older populations in China: a population-based cohort study

Table 2 Association of cooking fuels with cognitive impairment in the univariate and multivariable models

Fuel	N events/Incidence rate (per 100 person-years)	Model 1		Model 2		Model 3
Fuel	N events/Incidence rate (per 100 person-years)	HR (95% CI)	P	HR (95% CI)	P	HR (95% CI)	P
Clean fuel	216 / 2.77	1 (reference)		1 (reference)		1 (reference)
Never cooked in the home	10 / 5.97	3.04 (1.61, 5.74)	0.001	1.83 (0.97, 3.46)	0.064	1.63 (0.83, 3.22)	0.157
Biomass fuel	175 / 3.11	1.37 (1.12, 1.67)	0.002	1.30 (1.05, 1.60)	0.016	1.27 (1.02, 1.58)	0.030
Others	31 / 4.94	2.11 (1.45, 3.08)	0.000	1.88 (1.28, 2.77)	0.001	1.82 (1.23, 2.69)	0.003

Model 1 was a univariate model. The basic demographic characteristics were added in model 2, including age, sex, education, residence, household income, and marital status. All of the covariates in the model 3 were adjusted by adding smoking status, drinking status, regular exercise, ventilation of the kitchen when cooking at home, diet of fresh fruit and vegetables, limited in activities because of health problems during the last six months, BMI, and self-reported previous diseases based on model 2

ISSN: 1476-069X