Characteristics of the cohort subgroups at baseline
| Characteristic | Group; no. (%) of people* | ||
|---|---|---|---|
| Priority-population CHC n = 6575 | Nonpriority-population CHC n = 15 208 | Community control n = 1 673 200 | |
| Female sex | 3293 (50.1) | 9050 (59.5) | 978 646 (58.5) |
| Age group, yr | |||
| 21–35 | 1656 (25.2) | 3712 (24.4) | 361 560 (21.6) |
| 35–49 | 2240 (34.1) | 4373 (28.8) | 477 381 (28.5) |
| 50–64 | 2212 (33.6) | 5016 (33.0) | 502 974 (30.1) |
| ≥ 65 | 467 (7.1) | 2107 (13.9) | 331 285 (19.8) |
| Income quintile† | |||
| Quintile 1 (lowest) | 3030 (46.1) | 6049 (39.8) | 346 854 (20.7) |
| Quintile 2 | 1367 (20.8) | 3258 (21.4) | 330 170 (19.7) |
| Quintile 3 | 961 (14.6) | 2362 (15.5) | 326 318 (19.5) |
| Quintile 4 | 687 (10.4) | 1960 (12.9) | 340 802 (20.4) |
| Quintile 5 (highest) | 448 (6.8) | 1495 (9.8) | 318 302 (19.0) |
| Residential instability† | |||
| Quintile 1 (lowest) | 218 (3.3) | 1284 (8.4) | 300 967 (18.0) |
| Quintile 2 | 373 (5.7) | 1715 (11.3) | 293 752 (17.6) |
| Quintile 3 | 611 (9.3) | 2526 (16.6) | 296 501 (17.7) |
| Quintile 4 | 1328 (20.2) | 3528 (23.2) | 325 170 (19.4) |
| Quintile 5 (highest) | 3960 (60.2) | 5980 (39.3) | 443 292 (26.5) |
| Material deprivation† | |||
| Quintile 1 (lowest) | 337 (5.1) | 1278 (8.4) | 278 032 (16.6) |
| Quintile 2 | 494 (7.5) | 1828 (12.0) | 307 538 (18.4) |
| Quintile 3 | 795 (12.1) | 2528 (16.6) | 319 847 (19.1) |
| Quintile 4 | 1354 (20.6) | 2838 (18.7) | 341 218 (20.4) |
| Quintile 5 (highest) | 3510 (53.4) | 6561 (43.1) | 413 047 (24.7) |
| Dependency† | |||
| Quintile 1 (lowest) | 1533 (23.3) | 2890 (19.0) | 416 126 (24.9) |
| Quintile 2 | 1477 (22.5) | 2660 (17.5) | 325 971 (19.5) |
| Quintile 3 | 1250 (19.0) | 2878 (18.9) | 299 413 (17.9) |
| Quintile 4 | 1069 (16.3) | 3068 (20.2) | 283 751 (17.0) |
| Quintile 5 (highest) | 1161 (17.7) | 3537 (23.3) | 334 421 (20) |
| Ethnic concentration† | |||
| Quintile 1 (lowest) | 1101 (16.7) | 4076 (26.8) | 257 281 (15.4) |
| Quintile 2 | 1227 (18.7) | 2679 (17.6) | 285 263 (17.0) |
| Quintile 3 | 1089 (16.6) | 2032 (13.4) | 320 477 (19.2) |
| Quintile 4 | 1727 (26.3) | 3034 (20.0) | 366 559 (21.9) |
| Quintile 5 (highest) | 1346 (20.5) | 3212 (21.1) | 430 102 (25.7) |
| Recent immigrant status‡ | 148 (2.3) | 560 (3.7) | 65 024 (3.9) |
| Rural residence§ | 214 (3.3) | 2958 (19.5) | 164 704 (9.8) |
| Rostered to family physician | 2029 (30.9) | 4467 (29.4) | 1 368 951 (81.8) |
| Mental-health–related care¶** | |||
| Psychotic disorder | 1596 (24.3) | 3587 (23.6) | 180 503 (10.8) |
| Nonpsychotic disorder | 3680 (56.0) | 8011 (52.7) | 934 312 (55.8) |
| Substance use disorder | 2832 (43.1) | 3250 (21.4) | 182 173 (10.9) |
| Other mental health | 1234 (18.8) | 2359 (15.5) | 238 961 (14.3) |
| Comorbidities | |||
| Asthma†† | 1700 (25.9) | 3765 (24.8) | 313 695 (18.7) |
| COPD†† | 1360 (20.7) | 3026 (19.9) | 204 227 (12.2) |
| Diabetes†† | 1073 (16.3) | 2815 (18.5) | 249 948 (14.9) |
| Hypertension†† | 1738 (26.4) | 4973 (32.7) | 541 200 (32.0) |
| Infective endocarditis** | 48 (0.7) | 21 (0.1) | 1089 (0.1) |
| Rheumatoid arthritis** | 55 (0.8) | 116 (0.8) | 4985 (0.3) |
| Congestive heart failure†† | 146 (2.2) | 455 (3.0) | 45 813 (2.7) |
| Chronic liver disease** | 1394 (21.2) | 1400 (9.2) | 65 287 (3.9) |
| Chronic kidney disease** | 459 (7.0) | 1183 (7.8) | 82 278 (4.9) |
| Crohn disease/ulcerative colitis** | 51 (0.8) | 163 (1.1) | 18 461 (1.1) |
| HIV infection†† | 23 (0.3) | 21 (0.1) | 758 (< 0.1) |
| Comorbidities within 1 yr before index date | |||
| Skin/soft-tissue infection | 1094 (16.6) | 1742 (11.5) | 105 782 (6.3) |
| Chronic pain | 1690 (25.7) | 3783 (24.9) | 224 204 (13.4) |
Note: CHC = Community Health Centre, COPD = chronic obstructive pulmonary disease.
↵* Percentages may not total 100% owing to missing data.
↵† Drawn from the Ontario Marginalization Index.24,25
↵‡ Presence in the Immigration, Refugees and Citizenship Canada Permanent Residents database with a landing date less than 10 years before the index date.
↵§ Settlement of less than 10 000 people.
↵¶ Includes any hospital admission or 2 claims in 2 years or less of any eligible diagnostic or fee code (Appendix 1, Supplemental Table S1).
↵** Within 3 years before the index date.
↵†† Any diagnosis before the index date.