Table 1

Basic characteristics and dementia syndromes of participants with and without environmental tobacco smoke (ETS) exposure in the five-province study, China

ETS exposure
No (n=3768)Yes (n=2153)
Variablen%n%p Value
Age
 Mean (SD)72.997.5372.027.43<0.001
Sex
 Men164043.595344.30.581
 Women212856.5120055.7
Body mass index (kg/m2)
 <25269274.9154674.90.971
 25–29.976521.343621.1
 ≥301373.8813.9
Smoking status
 Never261069.3115953.8<0.001
 Former3679.736116.8
 Current79121.063329.4
Urban/rural
 Urban198652.778336.4<0.001
 Rural178247.3137063.6
Educational level
 College/university2346.2884.1<0.001
 High secondary school40910.91416.6
 Secondary school57915.425912.0
 Primary school90023.959827.8
 Illiterate164343.6106449.5
Main occupation
 Official/teacher68318.124311.3<0.001
 Manual labourer69418.434015.8
 Business230.6160.7
 Housewife3278.71537.1
 Other2917.71225.7
 Farmer174846.4127859.4
Annual income
 Very satisfactory3439.11798.30.519
 Satisfactory161743.094343.9
 Average151840.484939.6
 Poor2817.51758.2
Marriage
 Married251966.9162275.4<0.001
 Widow112629.947622.1
 Divorced190.5100.5
 Never married1012.7442.0
Having a religious belief
 No322785.8174081.0<0.001
 Yes with religious activity3689.828213.1
 Yes without religious activity1684.51255.8
Current drinking
 No325886.6174581.0<0.001
 Yes50513.440819.0
Visiting children or relatives
 Every day156441.694544.0<0.001
 1–3/week128734.261128.4
 ≤1/month90824.259227.6
Hypertension
 No158643.286641.10.114
 Yes208256.8124158.9
Diabetes
 No351493.4201593.80.499
 Yes2506.61336.2
Stroke
 No362196.2206596.30.893
 Yes1433.8803.7
Depressive syndrome (level)
 0335188.9188387.50.214
 1–22145.71436.6
 3–52035.41275.9
Dementia syndrome (level)
 No290377.0152370.7<0.001
 1–253114.133815.7
 3–53348.929213.6