Table 1 Individual characteristics of contracted and noncontracted residents at baseline before and after matching

N

103,763

19,844

19,547

19,547

26,934

4214

4121

4121

Age

< 0.001

0.830

< 0.001

0.979

≤ 30

30 (0.0)

31 (0.2)

15 (0.1)

14 (0.1)

20 (0.1)

14 (0.3)

10 (0.2)

12 (0.3)

30 < age ≤ 40

476 (0.5)

323 (1.6)

296 (1.5)

287 (1.5)

154 (0.6)

107 (2.5)

78 (1.9)

79 (1.9)

40 < age ≤ 50

4412 (4.3)

1668 (8.4)

1712 (8.8)

1655 (8.5)

1132 (4.2)

420 (10.0)

417 (10.1)

414 (10.0)

50 < age ≤ 60

22,535 (21.7)

5317 (26.8)

5202 (26.6)

5251 (26.9)

5947 (22.1)

1161 (27.6)

1169 (28.4)

1142 (27.7)

60 < age ≤ 70

36,420 (35.1)

6423 (32.4)

6450 (33.0)

6349 (32.5)

9868 (36.6)

1303 (30.9)

1278 (31.0)

1276 (31.0)

70 < age ≤ 80

27,561 (26.6)

4245 (21.4)

4104 (21.0)

4191 (21.4)

7162 (26.6)

869 (20.6)

852 (20.7)

860 (20.9)

80 < age ≤ 90

11,685 (11.3)

1749 (8.8)

1679 (8.6)

1715 (8.8)

2550 (9.5)

331 (7.9)

306 (7.4)

329 (8.0)

>90

644 (0.6)

88 (0.4)

89 (0.5)

85 (0.4)

101 (0.4)

9 (0.2)

11 (0.3)

9 (0.2)

Gender

< 0.001

0.332

< 0.001

0.947

Female

57,950 (55.8)

9838 (49.6)

9776 (50.0)

9679 (49.5)

15,071 (56.0)

1921 (45.6)

1893 (45.9)

1889 (45.8)

Male

45,813 (44.2)

10,006 (50.4)

9771 (50.0)

9868 (50.5)

11,863 (44.0)

2293 (54.4)

2228 (54.1)

2232 (54.2)

Comorbidity

< 0.001

0.905

0.905

< 0.0011

< 0.0011

0.947

No

74,938 (72.2)

16,386 (82.6)

16,138 (82.6)

16,128 (82.5)

4973 (18.5)

1653 (39.2)

1590 (38.6)

1586 (38.5)

Yes

28,825 (27.8)

3458 (17.4)

3409 (17.4)

3419 (17.5)

21,961 (81.5)

2561 (60.8)

2531 (61.4)

2535 (61.5)

Insurance Type

< 0.001

0.034

0.034

< 0.001

0.946

URRBMI

21,543 (20.8)

396 (2.0)

392 (2.0)

392 (2.0)

4519 (16.8)

58 (1.4)

56 (1.4)

57 (1.4)

UEBMI for employees

9770 (9.4)

2965 (14.9)

3077 (15.7)

2892 (14.8)

2740 (10.2)

810 (19.2)

800 (19.4)

771 (18.7)

UEBMI for retirees

72,450 (69.8)

16,483 (83.1)

16,078 (82.3)

16,263 (83.2)

19,675 (73.0)

3346 (79.4)

3265 (79.2)

3293 (79.9)

BMI

< 0.001

0.845

< 0.001

0.477

18.5–24.9

45,536 (43.9)

9895 (49.9)

9702 (49.6)

9737 (49.8)

12,615 (46.8)

2211 (52.5)

2142 (52.0)

2163 (52.5)

≥ 25

55,141 (53.1)

9374 (47.2)

9291 (47.5)

9245 (47.3)

13,540 (50.3)

1882 (44.7)

1851 (44.9)

1837 (44.6)

< 18.5

2540 (2.4)

496 (2.5)

469 (2.4)

487 (2.5)

712 (2.6)

114 (2.7)

114 (2.8)

114 (2.8)

Missing

546 (0.5)

79 (0.4)

85 (0.4)

78 (0.4)

67 (0.2)

7 (0.2)

14 (0.3)

7 (0.2)

Disease Duration^a

10.39 (6.85)

10.55 (6.88)

0.004

10.38 (6.97)

10.53 (6.84)

0.380

-

-

-

-

-

-

Average Scores of SBP^a

0.93 (0.17)

0.94 (0.16)

< 0.001

0.94 (0.16)

0.94 (0.16)

0.342

-

-

-

-

-

-

Average Scores of DBP^a

0.97 (0.12)

0.97 (0.11)

< 0.001

0.97 (0.11)

0.97 (0.11)

0.530

-

-

-

-

-

-

Average Scores of FBG^b

-

-

-

-

-

-

0.88 (0.22)

0.90 (0.21)

< 0.001

0.90 (0.20)

0.90 (0.21)

0.909