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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