Demographic, disease and DI characteristics for whole cohort and by cluster
| Characteristic | Overall cohort (n=33 371) | Cluster 1 (primary care only) (n=6107) 18.3% | Cluster 2 (referred to specialist with immediate action) (n=8987) 26.9% | Cluster 3 (multiple visits and procedures in specialist care) (n=11 893) 35.6% | Cluster 4 (specialist care only) (n=6384) 19.1% |
| Patient factors | |||||
| Sex | |||||
| Male | 54.6 | 54.2 | 52.2 | 54.7 | 58.3 |
| Female | 45.4 | 45.8 | 47.8 | 45.3 | 41.7 |
| Age | |||||
| Mean (SD) | 63.6 (15.7) | 62.1 (15.4) | 62.4 (15.9) | 64.2 (15.8) | 65.6 (15.2) |
| 20–45 | 13.5 | 15.2 | 15.2 | 12.8 | 10.9 |
| 46–55 | 16.1 | 17.2 | 17.9 | 15.7 | 13.6 |
| 56–65 | 22.2 | 23.8 | 22.8 | 21.7 | 21.0 |
| 66–75 | 22.9 | 23.0 | 21.2 | 23.1 | 24.9 |
| 76–85 | 18.2 | 16.1 | 16.3 | 18.7 | 21.9 |
| >85 | 7.0 | 4.7 | 6.7 | 8.0 | 7.8 |
| Comorbidity | |||||
| Minor ADG | |||||
| 0–1 | 10.2 | 11.2 | 11.2 | 9.8 | 8.5 |
| 2 | 10.0 | 11.2 | 10.4 | 10.0 | 8.0 |
| 3 | 11.7 | 13.0 | 13.0 | 11.6 | 8.7 |
| 4 | 13.1 | 14.5 | 13.1 | 13.1 | 11.7 |
| 5 | 12.7 | 12.3 | 13.0 | 12.9 | 12.5 |
| 6 | 11.4 | 11.2 | 11.5 | 11.1 | 11.7 |
| 7 | 9.7 | 9.3 | 8.9 | 9.7 | 11.2 |
| 8 | 7.7 | 6.9 | 7.3 | 7.4 | 9.5 |
| 9+ | 13.7 | 10.5 | 11.5 | 14.4 | 18.3 |
| Major ADG | |||||
| 0 | 38.0 | 41.7 | 41.4 | 37.9 | 29.7 |
| 1 | 30.6 | 31.4 | 31.3 | 29.8 | 30.2 |
| 2 | 17.5 | 16.2 | 15.8 | 17.1 | 21.6 |
| 3+ | 14.0 | 10.7 | 11.5 | 15.2 | 18.5 |
| Deprivation quintile | |||||
| 1 (least deprived) | 26.2 | 25.6 | 26.0 | 24.7 | 29.6 |
| 2 | 22.9 | 22.5 | 23.3 | 22.6 | 23.0 |
| 3 | 20.2 | 21.1 | 20.2 | 20.7 | 18.5 |
| 4 | 16.8 | 17.2 | 16.4 | 17.4 | 16.0 |
| 5 (most deprived) | 13.2 | 12.8 | 13.4 | 13.9 | 12.1 |
| Missing | 0.7 | 0.8 | 0.6 | 0.7 | 0.8 |
| Rurality | |||||
| Rural | 11.6 | 17.2 | 9.6 | 11.0 | 10.0 |
| Non-major urban | 28.1 | 36.2 | 24.7 | 28.4 | 24.5 |
| Major urban | 60.4 | 46.6 | 65.7 | 60.7 | 65.5 |
| Disease factors | |||||
| Histology | |||||
| Superficial spreading melanoma | 34.9 | 33.8 | 36.7 | 36.1 | 31.5 |
| Nodular melanoma | 11.5 | 10.1 | 11.6 | 13.3 | 9.7 |
| Lentigo maligna melanoma | 8.4 | 3.9 | 8.0 | 9.2 | 11.7 |
| Acral lentiginous melanoma | 0.9 | 0.7 | 0.8 | 0.9 | 1.3 |
| Other | 3.6 | 2.9 | 3.4 | 4.0 | 3.8 |
| NOS | 40.6 | 48.7 | 39.6 | 36.6 | 42.0 |
| Location | |||||
| Extremities | 44.4 | 44.9 | 48.4 | 42.6 | 41.7 |
| Trunk | 32.1 | 34.6 | 32.2 | 31.6 | 30.7 |
| Face | 12.1 | 6.9 | 11.8 | 13.6 | 14.5 |
| Scalp and neck | 6.7 | 4.6 | 6.1 | 7.3 | 8.3 |
| NOS | 4.7 | 9.0 | 1.5 | 4.9 | 4.8 |
| Stage | |||||
| I | 32.2 | 33.1 | 33.5 | 31.0 | 31.8 |
| II | 13.0 | 11.8 | 13.5 | 14.1 | 11.6 |
| III | 7.1 | 7.1 | 7.4 | 7.5 | 5.8 |
| IV | 2.6 | 4.3 | 1.1 | 2.8 | 2.5 |
| Missing | 45.1 | 43.7 | 44.4 | 44.6 | 48.3 |
| System factors | |||||
| County-level dermatologist density, per 100 000 population | |||||
| 0 | 18.9 | 28.5 | 15.3 | 18.5 | 15.7 |
| >0, ≤1 | 13.9 | 15.0 | 12.4 | 15.2 | 12.7 |
| >1, ≤2 | 32.2 | 31.2 | 31.3 | 35.0 | 29.4 |
| >2 | 34.9 | 25.2 | 41.1 | 31.3 | 42.3 |
| LHIN* | |||||
| A | 7.1 | 3.1 | 8.0 | 6.3 | 11.2 |
| B | 9.6 | 10.0 | 11.8 | 7.2 | 10.3 |
| C | 8.8 | 4.0 | 9.0 | 10.5 | 10.2 |
| D | 5.3 | 6.6 | 4.6 | 5.2 | 5.2 |
| E | 10.2 | 17.9 | 9.0 | 8.7 | 7.2 |
| F | 6.5 | 4.7 | 7.8 | 6.1 | 7.1 |
| G | 5.5 | 5.8 | 3.3 | 7.4 | 4.6 |
| H | 11.7 | 8.4 | 12.6 | 13.3 | 10.8 |
| I | 6.8 | 6.3 | 5.5 | 8.2 | 6.5 |
| J | 1.7 | 2.4 | 0.6 | 2.0 | 1.7 |
| K | 3.3 | 2.8 | 3.8 | 3.6 | 2.6 |
| L | 13.3 | 12.3 | 14.3 | 13.1 | 13.3 |
| M | 5.7 | 9.9 | 5.9 | 3.8 | 4.8 |
| N | 4.6 | 5.6 | 3.8 | 4.6 | 4.5 |
| Interval characteristics (days) | |||||
| DI length | (n=33 371) | ||||
| 25th percentile | 8.0 | 1.0 | 14.0 | 35.0 | 1.0 |
| 50th percentile | 36.0 | 1.0 | 31.0 | 67.0 | 23.0 |
| 75th percentile | 85.0 | 21.0 | 67.0 | 112.0 | 91.0 |
| 90th percentile | 142.0 | 68.0 | 115.0 | 175.0 | 146.0 |
| Primary care subinterval length | (n=26 987) | ||||
| 25th percentile | 6.0 | 1.0 | 13.0 | 10.0 | – |
| 50th percentile | 22.0 | 1.0 | 30.0 | 27.0 | – |
| 75th percentile | 54.0 | 21.0 | 66.0 | 56.0 | – |
| 90th percentile | 100.0 | 68.0 | 113.0 | 99.0 | – |
| Specialist care subinterval length | (n=27 264) | ||||
| 25th percentile | 1.0 | – | 1.0 | 9.0 | 1.0 |
| 50th percentile | 6.0 | – | 1.0 | 25.0 | 23.0 |
| 75th percentile | 42.0 | – | 1.0 | 57.0 | 91.0 |
| 90th percentile | 97.0 | – | 1.0 | 100.0 | 147.0 |
The bolded cells denote Pearson residuals >|4|.
n is the number of observations.
*LHINs have been anonymised.
ADG, adjusted diagnostic groups; LHIN, local health integration network; NOS, not otherwise specified.