Table 2.
Diagnostic interval, primary care subinterval, and specialist care subinterval lengths according to patient-, disease-, and system-level factors.
| Diagnostic interval (DI) (n = 33,371) | Primary care subinterval (PCI) (n = 26,987) | Specialist care subinterval (SCI) (n = 27,264) | ||||
|---|---|---|---|---|---|---|
| Characteristic | DI 50th percentile, days | DI 90th percentile, days | PCI 50th percentile, days | PCI 90th percentile, days | SCI 50th percentile, days | SCI 90th percentile, days |
| Overall | 36.0 | 142.0 | 22.0 | 100.0 | 6.0 | 97.0 |
| Patient factors | ||||||
| Sex | p = 1.00 | p = 0.65 | p = 0.10 | p = 0.007 | p = 0.004 | p < 0.001 |
| Male | 36.0 | 141.0 | 22.0 | 98.0 | 7.0 | 100.0 |
| Female | 36.0 | 142.0 | 23.0 | 103.0 | 5.0 | 92.0 |
| Age | p < 0.001 | p = 0.02 | p = 0.05 | p < 0.001 | p < 0.001 | p < 0.001 |
| 20–45 | 34.0 | 148.0 | 23.0 | 113.0 | 2.0 | 79.0 |
| 46–55 | 30.0 | 133.0 | 22.0 | 104.0 | 2.0 | 74.0 |
| 56–65 | 34.0 | 138.0 | 21.0 | 98.0 | 3.0 | 88.0 |
| 66–75 | 38.0 | 143.0 | 22.0 | 99.0 | 8.0 | 104.0 |
| 76–85 | 42.0 | 143.0 | 22.0 | 94.0 | 11.0 | 113.0 |
| >85 | 45.0 | 145.0 | 24.0 | 92.0 | 14.0 | 114.0 |
| Comorbidity | ||||||
| Minor ADG | p < 0.001 | p < 0.001 | p = 0.16 | p = 0.29 | p < 0.001 | p < 0.001 |
| 0–1 | 28.0 | 124.0 | 20.5 | 96.0 | 1.0 | 65.0 |
| 2 | 31.0 | 130.0 | 21.0 | 99.0 | 3.0 | 73.0 |
| 3 | 33.0 | 139.0 | 22.0 | 105.0 | 3.0 | 79.0 |
| 4 | 35.0 | 142.0 | 22.0 | 99.0 | 5.0 | 92.0 |
| 5 | 39.0 | 142.0 | 24.0 | 100.0 | 6.0 | 95.0 |
| 6 | 36.0 | 144.0 | 22.0 | 100.0 | 5.0 | 101.0 |
| 7 | 41.0 | 146.0 | 23.0 | 98.0 | 9.0 | 108.0 |
| 8 | 39.0 | 146.0 | 22.0 | 99.0 | 8.0 | 111.0 |
| 9+ | 49.0 | 152.0 | 22.0 | 104.0 | 16.0 | 121.0 |
| Major ADG | p < 0.001 | p < 0.001 | p = 0.17 | p = 0.02 | p < 0.001 | p < 0.001 |
| 0 | 30.0 | 128.0 | 21.0 | 98.0 | 2.0 | 71.0 |
| 1 | 36.0 | 141.0 | 22.0 | 100.0 | 5.0 | 98.0 |
| 2 | 42.0 | 150.0 | 22.0 | 101.0 | 10.0 | 113.0 |
| 3+ | 49.0 | 162.0 | 23.0 | 106.0 | 15.0 | 130.0 |
| Material deprivation quintile | p = 0.08 | p = 0.003 | p < 0.001 | p < 0.001 | p = 0.15 | p = 0.27 |
| 1 – least deprived | 38.0 | 146.0 | 24.0 | 106.0 | 7.0 | 100.0 |
| 2 | 37.0 | 144.0 | 23.0 | 103.0 | 5.0 | 98.0 |
| 3 | 36.0 | 141.0 | 22.0 | 98.0 | 5.0 | 94.0 |
| 4 | 35.0 | 139.0 | 21.0 | 99.0 | 6.0 | 94.0 |
| 5 – most deprived | 35.0 | 132.0 | 20.0 | 91.0 | 6.0 | 98.0 |
| Rurality | p < 0.001 | p = 0.91 | p < 0.001 | p = 0.19 | p = 0.001 | p = 0.41 |
| Rural | 27.0 | 140.0 | 17.0 | 97.0 | 3.0 | 94.0 |
| Non-major urban | 34.0 | 142.0 | 21.0 | 99.0 | 7.0 | 99.0 |
| Major urban | 39.0 | 142.0 | 24.0 | 102.0 | 6.0 | 98.0 |
| History of NMSC | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |
| Yes | 58.0 | 177.0 | 28.0 | 112.0 | 25.0 | 144.0 |
| No | 33.0 | 133.0 | 21.0 | 98.0 | 3.0 | 80.0 |
| Established with dermatology | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |
| Yes | 52.0 | 164.0 | 30.0 | 120.0 | 21.0 | 127.0 |
| No | 34.0 | 135.0 | 21.0 | 97.0 | 3.0 | 80.5 |
| Disease factors | ||||||
| Histology | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |
| Superficial spreading melanoma | 35.0 | 136.5 | 22.0 | 99.0 | 5.0 | 86.0 |
| Nodular melanoma | 34.0 | 122.0 | 20.0 | 90.0 | 6.0 | 85.0 |
| Lentigo maligna melanoma | 50.0 | 154.0 | 27.0 | 103.0 | 14.0 | 113.0 |
| Acral lentiginous melanoma | 53.0 | 146.0 | 27.5 | 100.5 | 27.5 | 112.0 |
| Other | 42.0 | 134.5 | 23.0 | 98.0 | 9.0 | 101.0 |
| NOS | 35.0 | 148.0 | 22.0 | 105.0 | 5.0 | 104.0 |
| Location | p < 0.001 | p < 0.001 | p < 0.001 | p = 0.17 | p < 0.001 | p < 0.001 |
| Extremities | 35.0 | 137.0 | 22.0 | 102.0 | 3.0 | 90.0 |
| Trunk | 33.0 | 138.0 | 21.0 | 97.0 | 5.0 | 93.0 |
| Face | 50.0 | 153.0 | 27.0 | 104.0 | 13.0 | 110.0 |
| Scalp and neck | 45.0 | 147.0 | 25.0 | 100.0 | 12.0 | 105.0 |
| NOS | 31.0 | 160.0 | 18.0 | 102.0 | 16.0 | 133.0 |
| Stage | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |
| I | 34.0 | 134.0 | 22.0 | 101.0 | 4.0 | 87.0 |
| II | 33.0 | 123.0 | 20.0 | 90.0 | 4.0 | 89.0 |
| III | 30.0 | 122.0 | 19.0 | 90.0 | 3.0 | 79.0 |
| IV | 21.0 | 120.0 | 14.0 | 84.0 | 7.0 | 101.0 |
| Missing | 41.5 | 157.0 | 25.0 | 105.0 | 8.0 | 108.0 |
| System factors | ||||||
| County-level dermatologist density per 100,000 population | p < 0.001 | p = 0.14 | p < 0.001 | p = 0.23 | p < 0.001 | p = 0.07 |
| 0 | 30.0 | 140.0 | 20.0 | 97.0 | 4.0 | 97.0 |
| >0, ≤1 | 38.0 | 148.0 | 22.0 | 98.0 | 9.0 | 100.0 |
| <1, ≤2 | 38.0 | 141.0 | 22.0 | 101.0 | 8.0 | 94.0 |
| >2 | 37.0 | 141.0 | 24.0 | 102.0 | 2.0 | 99.0 |
| LHIN | p < 0.001 | p = 0.009 | p < 0.001 | p < 0.001 | p < 0.001 | p < 0.001 |
| A | 38.0 | 137.0 | 23.0 | 101.0 | 4.0 | 105.0 |
| B | 33.0 | 143.0 | 24.0 | 108.0 | 1.0 | 91.0 |
| C | 42.0 | 141.0 | 24.0 | 96.0 | 9.0 | 98.5 |
| D | 34.5 | 142.0 | 21.0 | 92.0 | 8.0 | 100.0 |
| E | 29.0 | 142.0 | 19.0 | 101.0 | 2.0 | 102.0 |
| F | 35.0 | 137.0 | 25.0 | 100.0 | 2.0 | 87.5 |
| G | 43.0 | 141.0 | 19.0 | 87.0 | 20.0 | 105.0 |
| H | 42.0 | 150.0 | 24.0 | 103.0 | 7.0 | 98.0 |
| I | 45.0 | 156.0 | 24.0 | 102.0 | 14.0 | 106.0 |
| J | 28.0 | 128.0 | 15.0 | 100.0 | 14.0 | 76.0 |
| K | 37.0 | 130.0 | 22.0 | 91.0 | 7.0 | 93.0 |
| L | 37.0 | 135.0 | 23.0 | 102.0 | 5.0 | 91.0 |
| M | 27.0 | 138.0 | 20.0 | 99.0 | 1.0 | 103.0 |
| N | 29.0 | 148.0 | 19.0 | 112.0 | 4.0 | 85.0 |
PCI Primary Care subInterval, SCI Specialist Care subInterval, ADG Adjusted Diagnostic Groups, NMSC Non-Melanoma Skin Cancer, NOS Not Otherwise Specified, LHIN Local Health Integration Network.
p-values are calculated from unadjusted quantile regression.
Bold values highlight a significant p-value less than 0.05