Table 4.
Prevalence and incidence of select chronic diseases and health services utilization in the Ontario Health Study, overall and among those who provided a blood samplea
| Chronic disease or health service | Total (N = 188 351) |
Provided blood (N = 38 799) |
||||
|---|---|---|---|---|---|---|
| Prevalence | Incidenceb |
Prevalence | Incidenceb |
|||
| n | n | Per 100 000 person-years | n | n | Per 100 000 person-years | |
| Chronic diseases | ||||||
| Coronary artery disease | 26 599 | 13 639 | 983.6 | 7591 | 2752 | 1297.6 |
| Stroke | 4652 | 5496 | 339.7 | 1219 | 1139 | 432.2 |
| Ischaemic stroke | 4484 | 5344 | 329.9 | 1174 | 1116 | 422.9 |
| Hypertension | 44 827 | 16 775 | 1394.5 | 12 322 | 3109 | 1780.7 |
| Diabetes type 1 | 1271 | 1074 | 68.8 | 200 | 164 | 64.4 |
| Diabetes type 2 | 9404 | 6773 | 433.6 | 2188 | 1227 | 481.8 |
| Asthma | 28 472 | 3867 | 275.6 | 5454 | 627 | 267.1 |
| COPD | 11 159 | 7208 | 465.7 | 2883 | 1225 | 489.7 |
| Colitis | 3188 | 1800 | 109.7 | 864 | 305 | 113.7 |
| Crohn's | 3486 | 1202 | 73.3 | 862 | 184 | 68.5 |
| Dementia | 372 | 1764 | 105.8 | 119 | 296 | 108.3 |
| Congestive heart failure | 1932 | 2777 | 168.2 | 500 | 442 | 163.6 |
| Rheumatoid arthritis | 2133 | 1330 | 80.5 | 718 | 255 | 94.7 |
| HIV | 529 | 133 | 8.0 | 112 | 16 | 5.8 |
| Sepsis | 731 | 2680 | 161.0 | 186 | 429 | 157.1 |
| Pneumonia | 6551 | 7786 | 489.0 | 1445 | 1183 | 451.7 |
| Health services utilization | ||||||
| Hospitalizations | 105 829 | 61 434 | 3664 | 22 507 | 10 218 | 3712.9 |
| Mental health hospitalizations | 2566 | 2552 | 152.2 | 520 | 295 | 107.2 |
| Emergency department visits | 135 986 | 128 617 | 7670.8 | 29 123 | 24 960 | 9069.7 |
| Number of MRIs | ||||||
| 1 | 30 210 | 36 123 | 2360 | 2154 | 7697 | 2796.8 |
| 2 | 10 993 | 15 391 | 956.7 | 918 | 3285 | 1193.7 |
| 3 | 4682 | 7463 | 457.4 | 445 | 1486 | 540 |
| ≥4 | 5308 | 10 369 | 584.9 | 618 | 2149 | 780.9 |
Includes participants who consented to administrative linkages and were successfully linked; outcomes were ascertained through linkage to the validated disease registries developed by ICES; mean (SD) age in years is 47 (15) overall and 57 (10) among those who provided a blood sample.
Ascertained through linkage with the various disease cohorts/data sets covering the period from baseline to 31 March 2020 with the exception of congestive heart failure, which was ascertained through to 31 March 2019.
COPD, chronic obstructive pulmonary disease; HIV, human immunodeficiency virus; MRI, magnetic resonance imaging.