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Table 3 Association of cooking fuel types with cognitive impairment stratified by participant characteristics

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

Subgroup Biomass fuel
Adjusted HR (95% CI)
Others
Adjusted HR (95% CI)
P-value for interaction
All 1.27 (1.02, 1.58) 1.82 (1.23, 2.69)  
Sex    0.207
 Male 1.26 (0.87, 1.83) 3.37 (1.72, 6.60)  
 Female 1.16 (0.87, 2.30) 1.39 (0.84, 2.30)  
Education    0.604
 No school 1.08 (0.83, 1.42) 1.66 (1.05, 2.62)  
 1 year or more 1.54 (1.01, 5.53) 2.46 (1.10, 5.53)  
Residence    0.001
 Urban 0.82 (0.55, 1.22) 1.53 (0.87, 2.68)  
 Rural 1.44 (1.08, 3.90) 2.19 (1.23, 3.90)  
Household income CNY    0.197
  < 10,000 1.52 (1.04, 2.21) 2.12 (1.05, 4.25)  
 10,001–30,000 0.96 (0.61, 3.47) 1.67 (0.80, 3.47)  
  > 30,000 0.99 (0.66, 1.51) 1.40 (0.71, 2.77)  
Smoking status    0.001
 Non-smoker 1.33 (1.04, 1.71) 1.46 (0.91, 2.35)  
 Smoker 0.66 (0.38, 8.58) 3.97 (1.84, 8.58)  
Drinking status    0.078
 Non-drinker 1.19 (0.93, 1.53) 1.64 (1.06, 2.53)  
 Drinker 0.96 (0.56, 9.41) 3.48 (1.28, 9.41)  
Regular exercise    0.876
 Yes 1.28 (0.77, 2.12) 1.63 (0.78, 3.39)  
 No 1.18 (0.91, 2.77) 1.72 (1.07, 2.77)  
Ventilation of the kitchen when cooking at home    0.826
 no ventilation 0.74 (0.32, 1.69) 1.46 (0.42, 5.04)  
 kitchen ventilation or fan 0.88 (0.55, 3.45) 1.07 (0.33, 3.45)  
 by opening window 1.27 (0.93, 1.72) 1.86 (1.12, 3.10)  
 unknown 0.56 (0.14, 2.25) 1.64 (0.27, 9.93)  
Fresh fruit    0.352
 Almost or quite often 0.93 (0.63, 1.38) 1.24 (0.64, 2.41)  
 Occasionally 1.19 (0.82, 4.27) 2.22 (1.15, 4.27)  
 Rarely or never 1.68 (1.08, 2.61) 1.82 (0.75, 4.43)  
Limited in activities because of health problems during the last six months    0.449
 Yes 0.78 (0.51, 1.20) 1.23 (0.59, 2.58)  
 No 1.42 (1.09, 3.50) 2.18 (1.36, 3.50)  
Diabetes    0.006
 Yes 3.33 (0.73, 15.19) 1.09 (0.18, 6.50)  
 No 1.18 (0.93, 2.70) 1.76 (1.15, 2.70)  
 Unknown 1.19 (0.33, 4.33) 3.00 (0.44, 20.68)  
Heart diseases    0.174
 Yes 0.66 (0.26, 1.67) 1.99 (0.72, 5.46)  
 No 1.25 (0.98, 2.55) 1.62 (1.03, 2.55)  
 Unknown 1.02 (0.26, 4.03) 4.20 (0.48, 36.67)  
Stroke    0.077
 Yes 0.82 (0.30, 2.20) 0.40 (0.08, 1.86)  
 No 1.20 (0.95, 2.81) 1.84 (1.20, 2.81)  
 Unknown 3.14 (0.67, 14.65) 101.82 (6.25, 1659.95)