Table 1.

General Information of Study Subjects

Variables	Total (N = 537)	Male (N = 124)	Female (N = 413)	P.Value
Age	102.6 ± 2.8	102.3 ± 2.4	102.8 ± 2.9	0.060
Illiterate	87.3	58.1	95.2	<0.001
Widowed	88.8	62.9	93.5	<0.001
Han nationality	83.6	80.6	84.5	0.309
Smoker	9.9	5.6	6.1	0.048
Alcohol drinker	13.6	25.8	9.9	<0.001
Tea drinker	16.6	29.8	12.4	<0.001
No. of children	4.2 ± 2.2	4.5 ± 2.0	4.1 ± 2.3	0.027

P-value from Mann-Whitney U test for age and No. of children. Chisquare test for all other categorical variables. These tests were done to compare between males and females

Mean ± standard deviation presented for continuous variables