# Table 1 Description of variables (N = 816)

VariablesTotal sample (N = 816)Female (N = 426)Male (N = 390)
N/mean%/SDN/mean%/SDN/mean%/SD
Age38.7418.8238.8918.9738.5718.68
Gender
Female42652.21
Male39047.79
Marital Status
Unmarried27533.7014333.5713233.85
Married54166.3028366.4325866.15
Smoking
No36444.6121450.2315038.46
Yes45255.3921249.7724061.54
Brush teeth every day
No57069.8529068.0828071.79
Yes24630.1513631.9211028.21
Medical examination
No58872.0630270.8928673.33
Yes22827.9412429.1110426.67
Distance
Within three kilometers32239.4617942.0214336.67
Three kilometres away49460.5424757.9824763.33
Chronic diseases
Without59072.3030571.6028573.08
With22627.7012128.4010526.92
Socioeconomic Status
Low23628.9213832.399825.13
High58071.0828867.6129274.87
Educational Level
Illiteracy51362.8729869.9521555.13
Elementary and above30337.1312830.0517544.87
Poor housing conditions
Yes54466.6729769.7224763.33
No27233.3312930.2814336.67
Eqpcinc (thousand Yuan)7.158.626.888.477.448.78
Income-based group
Quintile1 (poor)40850.0021851.1719048.72
Quintile2 (rich)40850.0020848.8320051.28
Below the international poverty line a
No48959.9325259.1523760.77
Yes32740.0717440.8515339.23
Eq-5d index0.740.180.730.180.750.18
VAS69.9019.3369.0218.9570.8619.72
1. a The variable is defined if the per capita income of an individual is below the international poverty line (\$ 1.9 a day). Since the 2011 PPPs for Rural China is 3.04, the international poverty line for China rural residents is 1.9*3.04*365 = 2108.24 Yuan. If the per capita income of an individual was less than 2108.24 Yuan, the individual lived below the international poverty line