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Table 1 Characteristics of the cohort (aged 25–74 years) with a first admission of ischaemic heart disease, as principal discharge diagnosis, in the period of 2002–2007, WA residents

From: Patterns of Medicare-funded primary health and specialist consultations in Aboriginal and non-Aboriginal Australians in the two years before hospitalisation for ischaemic heart disease

 

All

Less than 55 years

55 years and over

Aboriginal

Non-Aboriginal

p-value

Aboriginal

Non-Aboriginal

p-value

Aboriginal

Non-Aboriginal

p-value

Number of patients (%)

1269 (4.7)

25,961 (95.3)

 

832 (65.6)

6706 (25.8)

< 0.001

437 (34.4)

19,255 (74.2)

< 0.001

First-ever, n (%)

1041 (82.0)

22,416 (86.3)

< 0.001

700 (84.1)

6074 (90.6)

< 0.001

341 (78.0)

16,342 (84.9)

< 0.001

Sub-types of IHD, n(%)

▪ Unstable angina

346 (27.3)

6186 (23.8)

< 0.001

224 (26.9)

1652 (24.6)

< 0.001

122 (27.9)

4534 (23.6)

< 0.001

▪ Acute myocardial infarction

456 (35.9)

7377 (28.4)

 

312 (37.5)

2259 (33.7)

 

144 (33.0)

5118 (26.6)

 

▪ Other IHD

466 (36.7)

12,391 (47.7)

 

296 (35.6)

2793 (41.7)

 

170 (38.9)

9598 (49.9)

 

▪ Subsequent MI

1 (0.1)

7 (0.03)

 

0

< 5 (0.0)

 

< 5 (0.2)

5 (0.0)

 

Total relevant MBS records (pre-2 years)

47,047 (3.5)

1,301,191 (96.5)

< 0.001

27,805 (59.1)

228,849 (17.6)

< 0.001

19,242 (40.9)

1,072,342 (82.4)

< 0.001

1st year before index admission, n(%)

26,365 (56.0)

733,063 (56.3)

0.200

15,735 (56.6)

129,341 (56.5)

0.818

10,630 (55.2)

603,722 (56.3)

0.012

2nd year before index, n(%)

20,682 (44.0)

568,128 (43.7)

 

12,070 (43.4)

99,508 (43.5)

 

8612 (44.8)

468,620 (43.7)

 

Mean age ± SD

50.2 ± 10.1

60.5 ± 9.3

< 0.001

44.4 ± 6.6

47.9 ± 5.4

< 0.001

61.4 ± 5.0

64.9 ± 5.7

< 0.001

Female sex, n(%)

574 (45.2)

7363 (28.4)

< 0.001

355 (42.7)

1621 (24.2)

< 0.001

219 (50.1)

5742 (29.8)

< 0.001

Urban/rural, n(%)

Rural

817 (64.4)

5260 (20.3)

< 0.001

541 (65.0)

1485 (22.1)

< 0.001

276 (63.2)

3775 (19.6)

< 0.001

Urban

452 (35.6)

20,701 (79.7)

 

291 (35.0)

5221 (77.9)

 

161 (36.8)

15,480 (80.4)

 

ARIA classification, n(%)

Highly accessible

282 (22.2)

12,641 (48.7)

< 0.001

177 (21.4)

3179 (47.5)

< 0.001

103 (23.9)

9454 (49.2)

< 0.001

Accessible

236 (18.6)

9362 (36.1)

 

155 (18.7)

2390 (35.7)

 

81 (18.8)

6971 (36.3)

 

Moderately accessible

202 (15.9)

2723 (10.5)

 

135 (16.3)

685 (10.2)

 

67 (15.6)

2034 (10.6)

 

Remote

42 (3.3)

416 (1.6)

 

25 (3.0)

111 (1.7)

 

17 (3.9)

295 (1.5)

 

Very Remote

505 (39.8)

812 (3.1)

 

337 (40.7)

327 (4.9)

 

163 (37.8)

469 (2.4)

 

Indeterminate

< 5 (0.2)

7 (0.03)

 

0

< 5 (0.0)

 

0

5 (0.0)

 

With private medical insurance, n (%)

34 (2.7)

11,603 (44.7)

< 0.001

21 (2.5)

2752 (41.0)

< 0.001

13 (3.0)

8851 (46.0)

< 0.001

Charlson comorbidity index (≥ 1), n %

446 (35.2)

6817 (26.3)

< 0.001

285 (34.3)

1879 (28.0)

< 0.001

161(36.8)

4938 (25.6)

< 0.001

Other comorbiditiesa, n (%)

➢ Hypertension

680 (53.6)

11,502 (44.3)

< 0.001

402 (48.3)

2317 (34.6)

< 0.001

278 (63.6)

9185 (47.7)

< 0.001

➢ Heart failure

130 (10.2)

1390 (5.4)

< 0.001

64 (7.7)

167 (2.5)

< 0.001

66 (15.1)

1223 (6.4)

< 0.001

➢ Chronic kidney disease

167 (13.2)

789 (3.0)

< 0.001

90 (10.8)

156 (2.3)

< 0.001

77 (17.6)

633 (3.3)

< 0.001

➢ Valvular heart disease

161 (12.7)

3367 (13.0)

0.770

86 (10.3)

459 (6.8)

< 0.001

75 (17.2)

2908 (15.1)

0.235

➢ Diabetes

665 (52.4)

5217 (20.1)

< 0.001

403 (48.4)

1010 (15.1)

< 0.001

262 (60.0)

4207 (21.9)

< 0.001

➢ COPD

169 (13.3)

1266 (4.9)

< 0.001

83 (10.0)

173 (2.6)

< 0.001

86 (19.7)

1093 (5.7)

< 0.001

➢ Cancer

59 (4.7)

3607 (13.9)

< 0.001

23 (2.8)

515 (7.7)

< 0.001

36 (8.2)

3092 (16.1)

< 0.001

➢ Cerebravascular disease

53 (4.2)

808 (3.1)

0.034

29 (3.5)

71 (1.1)

< 0.001

24 (5.5)

737 (3.8)

0.074

Mortality, n (%)

30-day mortality post-index

24 (1.9)

332 (1.3)

0.061

12 (1.4)

45 (0.7)

< 0.001

12 (2.8)

287 (1.5)

0.034

1-year mortality post-index

70 (5.5)

788 (3.0)

< 0.001

29 (3.5)

90 (1.3)

< 0.001

41 (9.4)

698 (3.6)

< 0.001

  1. aComorbidities were coded also as concurrent to index admission, which include principal diagnosis