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Table 2 Odds ratios (OR) for discharge against medical advice during first-ever hospital episode for ischaemic heart disease for full and restricted sub-cohorts, Western Australia 2000-2008

From: Voting with their feet - predictors of discharge against medical advice in Aboriginal and non-Aboriginal ischaemic heart disease inpatients in Western Australia: an analytic study using data linkage

  

Full cohort N=37,015

Emergency only N=22,459

Publicly funded N=25,664

No prior DAMA N=36,447

No revascularisation N=26,920

  

Events=219 R-Square=0.163

Events=210 R-Square=0.111

Events=212 R-Square=0.123

Events=183 R-Square=0.148

Events=194 R-Square=0.169

  

Crude OR (95%)

Adj OR (95% CI)

Adj OR (95% CI)

Adj OR (95% CI)

Adj OR (95% CI)

Adj OR (95% CI)

Aboriginality

Aboriginal

8.41

(6.03 - 11.7)

2.32

(1.54 - 3.48)

2.42

(1.60 - 3.66)

2.34

(1.55 - 3.52)

1.98

(1.24 - 3.18)

2.24

(1.44 - 3.47)

 

non-Aboriginal

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

Sex

Male

1.90

(1.35 - 2.67)

2.14

(1.52 - 3.02)

2.19

(1.54 - 3.11)

2.18

(1.53 - 3.1)

2.15

(1.47 - 3.15)

2.25

(1.58 - 3.21)

 

Female

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

Age

(years)

0.94

(0.93 - 0.95)

0.97

(0.95 - 0.98)

0.97

(0.96 - 0.98)

0.97

(0.95 - 0.98)

0.96

(0.95 - 0.98)

0.96

(0.95 - 0.98)

Soc Disadv a

1 (high)

2.46

(1.67 - 3.63)

1.25

(0.82 - 1.89)

1.17

(0.76 - 1.78)

1.26

(0.82 - 1.93)

1.37

(0.89 - 2.12)

1.36

(0.87 - 2.13)

2

1.42

(0.94 - 2.15)

0.91

(0.59 - 1.41)

0.88

(0.56 - 1.36)

0.95

(0.60 - 1.48)

0.84

(0.53 - 1.35)

1.02

(0.64 - 1.63)

3

2.13

(1.41 - 3.20)

1.42

(0.93 - 2.15)

1.38

(0.90 - 2.10)

1.51

(0.98 - 2.32)

1.36

(0.87 - 2.13)

1.57

(1.00 - 2.48)

4 (low)

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

Location b

Private hospital

0.08

(0.04 - 0.16)

0.17

(0.08 - 0.36)

0.19

(0.08 - 0.42)

n/a

 

0.19

(0.09 - 0.41)

0.20

(0.09 - 0.43)

RH-MR b

0.78

(0.11 - 5.61)

0.57

(0.08 - 4.13)

0.57

(0.08 - 4.12)

0.58

(0.08 - 4.18)

0.64

(0.09 - 4.66)

0.42

(0.06 - 3.07)

RH-RR b

2.66

(1.93 - 3.65)

1.51

(1.04 - 2.18)

1.50

(1.03 - 2.18)

1.51

(1.05 - 2.19)

1.51

(1.01 - 2.27)

1.12

(0.77 - 1.63)

MH-RR b

0.73

(0.45 - 1.18)

0.46

(0.28 - 0.77)

0.50

(0.30 - 0.84)

0.46

(0.27 - 0.77)

0.46

(0.25 - 0.82)

0.45

(0.25 - 0.80)

MH-MR b

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

IHD type

MI

2.35

(1.63 - 3.39)

0.89

(0.59 - 1.35)

0.86

(0.57 - 1.30)

0.92

(0.60 - 1.39)

0.92

(0.59 - 1.45)

1.07

(0.69 - 1.64)

 

Unstable Angina

4.05

(2.83 - 5.79)

1.97

(1.34 - 2.89)

1.87

(1.27 - 2.76)

1.97

(1.33 - 2.92)

1.92

(1.26 - 2.93)

2.12

(1.44 - 3.12)

 

Other IHD

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

Admission type

Emergency

14.9

(7.64 - 29.07)

5.93

(2.88 -12.20)

n/a

 

5.39

(2.53 -11.60)

6.91

(3.05 - 15.66)

7.01

(3.26 - 15.05)

Booked

1.00

 

1.00

   

1.00

 

1.00

 

1.00

 

Co-morbidity

Charlson index

1.04

(0.97 - 1.12)

1.00

(0.93 - 1.09)

0.99

(0.91 - 1.08)

1.00

(0.93 - 1.09)

0.98

(0.89 - 1.08)

0.97

(0.89 - 1.06)

Alc/MH c

Alcohol only

7.27

(5.14 - 10.29)

2.92

(2.01 - 4.24)

2.97

(2.03 - 4.33)

2.93

(2.02 - 4.26)

2.68

(1.75 - 4.11)

2.77

(1.86 - 4.12)

 

MH only

1.76

(0.9 - 3.46)

1.42

(0.72 - 2.83)

1.48

(0.75 - 2.95)

1.30

(0.63 - 2.69)

1.16

(0.51 - 2.66)

1.49

(0.75 - 2.98)

 

Both

7.87

(4.42 - 14)

2.97

(1.62 - 5.47)

3.13

(1.7 - 5.77)

2.99

(1.63 - 5.51)

3.21

(1.52 - 6.80)

2.04

(1.00 - 4.18)

 

Neither

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

Admission period

2000-2004

0.92

(0.70 - 1.20)

0.90

(0.68 - 1.18)

0.95

(0.72 - 1.26)

0.91

(0.69 - 1.2)

0.89

(0.66 - 1.19)

0.96

(0.72 - 1.28)

2005-2008

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 

1.00

 
  1. Adj OR: odds ratio adjusting for all variables shown table; 95% CI: 95% confidence interval. Bold ORs are statistically significant.
  2. a Social Disadvantage.
  3. b Hospital type in combination with residential location: RH=Rural hospital; MH= Metro hospital; MR=Metro Residence; RR=Rural Residence.
  4. c History of alcohol and/or mental health admission.