Effect of proportion of late surgery patients on mortality in different severity groups of hip fracture patients
| n (%) | One year mortality | Slope*(p value) | ||||
|---|---|---|---|---|---|---|
| 10% of patients with late surgery | 15% of patients with late surgery | 20% of patients with late surgery | 30% of patients with late surgery | |||
| *Change in percentage of deaths when the share of patients with late surgey increased 10%. | ||||||
| †Corresponds to fig 4. Example: Expected mortality for late surgery patients in provider with 10% of patients with late surgery is 35%. These percentages can be interpreted as coordinates (0.10, 0.35) which hit the dotted curve in fig 4. | ||||||
| ‡Calculated from the equation: ml(X) = (m(X) − (1−X) * me(X))/X, where X is the proportion of late surgery patients, m(X) refers to overall mortality at X, me(X) to early surgery mortality at X, and ml(X) to late surgery mortality at X. Example: ml(0.1) = (0.2903 − 0.9 * 0.2837)/0.1 = 0.3497. | ||||||
| All patients (adjusted mortality)† | ||||||
| Overall | 16881 | 29.0 | 29.3 | 29.5 | 30.0 | 0.5 (<0.05) |
| Early surgery | 14426 (85) | 28.4 | 28.8 | 29.3 | 30.2 | 0.9 (<0.01) |
| Late surgery‡ | 2455 (15) | 35.0‡ | 31.9 | 30.5 | 29.7 | |
| Patient group 1 (least severe) | ||||||
| Overall | 3376 (20) | 9.4 | 9.3 | 9.2 | 9.0 | −0.2 (0.232) |
| Early surgery | 2931 (87) | 8.8 | 8.6 | 8.4 | 8.1 | −0.3 (0.168) |
| Late surgery | 445 (13) | 15.4 | 13.4 | 12.4 | 11.1 | |
| Patient group 2 | ||||||
| Overall | 3376 (20) | 18.0 | 17.9 | 17.8 | 17.6 | −0.2 (0.283) |
| Early surgery | 2932 (87) | 17.4 | 17.5 | 17.7 | 17.9 | 0.2 (0.310) |
| Late surgery | 444 (13) | 23.8 | 20.1 | 18.4 | 16.7 | |
| Patient group 3 | ||||||
| Overall | 3376 (20) | 26.9 | 27.2 | 27.6 | 28.2 | 0.6 (0.101) |
| Early surgery | 2875 (85) | 26.6 | 27.5 | 28.5 | 30.4 | 1.9 (<0.01) |
| Late surgery | 501 (15) | 29.7 | 25.4 | 23.8 | 23.1 | |
| Patient group 4 | ||||||
| Overall | 3377 (20) | 37.9 | 38.3 | 38.7 | 39.5 | 0.8 (0.126) |
| Early surgery | 2869 (85) | 37.4 | 38.3 | 39.2 | 41.1 | 1.8 (<0.05) |
| Late surgery | 508 (15) | 43.0 | 38.5 | 36.7 | 35.8 | |
| Patient group 5 (most severe) | ||||||
| Overall | 3376 (20) | 51.4 | 51.9 | 52.5 | 53.5 | 1.1 (<0.05) |
| Early surgery | 2819 (84) | 50.7 | 50.6 | 50.6 | 50.5 | −0.1 (0.455) |
| Late surgery | 557 (16) | 57.9 | 59.3 | 59.9 | 60.6 | |