Table 1 Summary statistics of the whole sample and stratified by insurance status

Area

Whole cohort

2424

2349

75

2347

77

257

2167

Northern area

1001

969

32

968

33

101

900

Central area

702

678

24

677

25

74

628

Southern area

444

428

16

428

16

48

396

Eastern area

103

101

2

101

2

10

93

Offshore islands

174

173

1

173

1

24

150

p-value

(<0.001)

(<0.001)

(0.688)

Household size

3.957

4.014

2.173

4.140

2.220

4.595

3.882

Mean (sd)

(1.711)

(1.706)

(0.381)

(1.769)

(0.476)

(2.042)

(1.651)

P- value

(<0.001)

(<0.001)

(<0.001)

Household income (Percentage)

Less than 135,000

23.47

23.41

25.33

23.43

24.68

18.68

24.04

135,000-225,000

18.44

18.18

26.67

18.19

25.97

6.61

19.84

225,000-450,000

25.04

25.03

25.33

25.05

24.68

22.18

25.38

450,000-675,000

18.56

18.82

10.67

18.75

12.99

25.68

17.72

More than 6750,000

14.48

14.56

12.00

14.57

11.69

26.85

13.01

P- value

(0.207)

(0.372)

(<0.001)

Household expense (Percentage)

Less than 45,000

11.06

11.15

8.00

11.16

7.79

5.45

11.72

45,000-135,000

25.41

25.37

26.67

25.39

25.97

15.18

26.63

135,000-225,000

36.63

36.82

30.67

36.77

32.47

22.18

38.35

225,000-450,000

18.56

18.48

21.33

18.49

20.78

33.46

16.80

More than 450,000

8.33

8.17

13.33

8.18

12.99

23.74

6.51

P- value

(0.393)

(0.488)

(<0.001)

Number of inpatient treatment (Percentage)

None

69.22

69.60

57.33

69.58

58.44

78.21

68.16

One

20.50

20.43

22.67

20.45

22.08

21.79

20.35

Two

7.47

7.54

5.33

7.54

5.19

0

8.35

Three

1.49

1.53

0

1.53

0

0

1.66

Four

0.08

0.09

0

0.09

0

0

0.09

Five or more

1.24

0.81

14.67

0.81

14.29

0

1.38

P-value

(<0.001)

(<0.001)

(<0.001)

Presence of chronic disease (Percentage)

Yes

36.63

36.61

37.33

36.64

36.36

33.07

37.06

No

63.37

63.39

62.67

63.36

63.64

66.93

62.94

P-value

(0.995)

(0.944)

(0.236)