Table 3 Hazard ratios and risk score points for the final prediction model

Age

 50–54

ref

83

 55–59

0.92

(0.74–1.13)

76

 60–64

0.76

(0.61–0.96)

60

 65–69

0.76

(0.55–1.04)

59

 70–75

0.38

(0.22–0.65)

0

Race

 Non-White

ref

0

 White

1.48

(1.14–1.91)

34

Insurance

 Uninsured

ref

3

 Medicaid

1.15

(0.90–1.48)

15

 Medicare

1.03

(0.77–1.38)

5

 Commercial

0.97

(0.67–1.40)

0

Census Tract GINI Income Inequality

 0.27–0.38

ref

0

 0.38–0.41

1.14

(0.87–1.49)

11

 0.41–0.43

1.17

(0.90–1.53)

14

 0.43–0.47

1.25

(0.94–1.66)

19

 0.47–0.82

1.27

(0.97–1.67)

21

Long term anticoagulant use

 No

ref

54

 Yes

0.54

(0.29–1.01)

0

Flu shot within 1 year of index date

 No

ref

0

 Yes

1.59

(1.28–1.98)

40

Count of no-show encounters in the year prior to the index date

 0

ref

31

 1

1.07

(0.86–1.34)

37

 2+

0.7

(0.53–0.92)

0

Health Center

 HC 8

ref

0

 HC 7

1.45

(0.82–2.58)

32

 HC 4

2.59

(1.62–4.14)

82

 HC 2

1.65

(1.12–2.44)

43

 HC 5

3.01

(2.02–4.49)

95

 HC 6

1.33

(0.86–2.06)

25

 HC 3

3.18

(2.05–4.92)

100