Table 2 Comparison of mortality risk for elderly patients with and without CO

All

965

289

5131.3

56.32

9650

1456

59034.95

24.66

2.29 (2.01–2.59)

<0.0001

 65–74

531

128

3097.15

41.33

5322

643

34007.74

18.91

2.19 (1.81–2.65)

<0.0001

 75–84

360

129

1720.28

74.99

3599

688

21018.46

32.73

2.29 (1.9–2.76)

<0.0001

 ≥85

74

32

313.87

101.95

729

125

4008.75

31.18

3.27 (2.22–4.82)

<0.0001

 Male

502

194

2611.37

74.29

5020

877

31878.11

27.51

2.7 (2.31–3.16)

<0.0001

 Female

463

95

2519.93

37.7

4630

579

27156.85

21.32

1.77 (1.42–2.2)

<0.0001

 DM

291

113

1446.51

78.12

1502

341

8489.47

40.17

1.94 (1.57–2.41)

<0.0001

 HTN

438

134

2286.75

58.6

3369

621

19093.71

32.52

1.8 (1.49–2.17)

<0.0001

 Renal disease

57

28

218.35

128.23

254

78

1308.83

59.6

2.18 (1.41–3.36)

0.0004

 Stroke

120

52

543.46

95.68

798

215

4255.75

50.52

1.89 (1.4–2.56)

<0.0001

CHF

49

19

208.15

91.28

238

78

1207.95

64.57

1.41 (0.86–2.33)

0.176

 Liver disease

43

15

235.48

63.7

345

85

2011.18

42.26

1.51 (0.87–2.61)

0.143

 Cancer

59

30

211.4

141.91

364

104

1670.29

62.26

2.28 (1.52–3.42)

<0.0001

 COPD

133

52

644.82

80.64

847

256

4937.64

51.85

1.56 (1.15–2.1)

0.0037

 0–1 month

965

7

80.15

87.34

9650

15

803.5

18.67

5.01 (2.02–12.42)

0.0005

 1–6 months

958

43

389.54

110.39

9635

86

3997.24

21.52

5.13 (3.56–7.4)

<0.0001

 6–12 months

915

37

448.48

82.5

9549

127

4742.7

26.78

3.08 (2.14–4.44)

<0.0001

 1–2 years

878

51

815.21

62.56

9422

188

8964.55

20.97

2.98 (2.19–4.07)

<0.0001

 2–4 years

757

64

1305.36

49.03

8489

328

14932.6

21.97

2.23 (1.71–2.92)

<0.0001

 4–6 years

552

39

917.42

42.51

6389

320

10909.76

29.33

1.45 (1.04–2.03)

0.0274

 >6 years

380

48

1175.14

40.85

4604

392

14684.61

26.69

1.53 (1.13–2.06)

0.0054