Table 2 Characteristics of the sample

Sex of householder

Male

1864

45.50

23.07

Female

2233

54.50

23.96

Age of householder

< 65

2219

54.16

17.89^**

≥65

1878

45.84

30.24

Family’s main residence

Urban

1240

30.27

17.42^**

Rural

2857

69.73

26.22

Educational level of householder

Illiterate

978

23.87

30.67^**

Primary school

1783

43.52

25.18

Junior high school and above

1336

32.61

16.24

Marital status of householder

Married

3199

78.08

23.94

Single (including divorced, single, widowed and unmarried)

898

21.92

22.16

Household size

Single-person households

522

12.74

27.01^**

Two-person households

2930

71.52

24.54

Cohabitation of three or more persons

645

15.74

16.28

Region

East

1309

31.95

25.44

Central

1380

33.68

22.32

West

1408

34.37

23.01

URRBMI

477

11.64

27.46^**

UEBMI

623

15.21

17.66

NRCMS

2602

63.51

25.37

URBMI

192

4.69

17.19

Other medical insurance (including uninsured)

203

4.95

15.27