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

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

Fuel N events/Incidence rate (per 100 person-years) Model 1 Model 2 Model 3
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
  1. 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