Table 1 Demographic characteristics of patients in the 9 National Quality Registers (NQRs) and in the general population
Variable | Intervention-based registers | Diagnosis-based registers | General population | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Spine | Hip | Knee | Ankle | Cruciate ligament | BOA | Heart failure | Respiratory failure | Bipolar | ||
n = 44,196 | n = 90,658 | n = 16,324 | n = 668 | n = 8,155 | n = 6,690 | n = 1,044 | n = 725 | n = 3,610 | n = 41,761 | |
% | % | % | % | % | % | % | % | % | % | |
Age in years [mean (SD)] | 58.4 (4.3) | 68.5 (10.3) | 68.9 (8.7) | 63.0 (11.7) | 29.7 (10.0) | 65.8 (9.0) | 71.8 (11.1) | 73.2 (7.7) | 58.4 (15.3) | 45.5 (14.9) |
Age group | ||||||||||
 30 | 3.6 | 0.1 | 0.01 | 1.5 | 59.2 | 0.1 | 0.2 | - | 15.0 | 17.1 |
 30–39 | 9.9 | 0.7 | 0.1 | 3.0 | 21.2 | 0.5 | 0.5 | 0.1 | 18.8 | 20.4 |
 40–49 | 16.2 | 3.7 | 1.7 | 7.5 | 15.3 | 4.3 | 3.1 | 0.1 | 20.7 | 20.8 |
 50–59 | 18.5 | 13.0 | 13.1 | 21.1 | 4.1 | 17.3 | 10.6 | 4.6 | 18.9 | 21.6 |
 60–69 | 24.1 | 33.4 | 35.6 | 33.5 | 0.3 | 43.8 | 22.6 | 26.2 | 17.5 | 14.9 |
 70–79 | 21.7 | 35.2 | 38.6 | 30.2 | 0.01 | 28.3 | 35.8 | 47.7 | 7.8 | 4.8 |
 80 +  | 6.1 | 13.9 | 11.0 | 3.1 | - | 5.6 | 27.2 | 21.2 | 1.3 | 0.4 |
Sex | ||||||||||
 Women | 51.1 | 56.5 | 57.5 | 44.8 | 44.7 | 70.8 | 31.9 | 60.6 | 64.1 | 56.2 |