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Table 4 Quantile regression estimates of the median and 75th percentile of the diagnostic interval for non-urgent colorectal cancer patients (n = 7198). The estimate associated with each category is the difference in days when compared to the reference category

From: Factors associated with mode of colorectal cancer detection and time to diagnosis: a population level study

  Q0.50   Q0.75  
  Days P-value Days P-value
Intercept 7.28 0.89 15 0.08
Age at diagnosis
 < 50 2.33 0.5 −0.96 0.92
 50–59 4.85 0.09 3.39 0.58
 60–69 0 . 0 .
 70–79 5 0.0425 8.59 0.17
 ≥ 80 14.27 0.0001 34.28 0.0003
Residential Zones
 Calgary 0 . 0 .
 Central 3.18 0.33 9.23 0.25
 Edmonton −0.62 0.81 1.13 0.85
 North 0.98 0.79 8.67 0.44
 South −7.15 0.0189 −15.33 0.0455
Anatomic site
 Colon 6.47 0.0014 9.56 0.0536
 Rectum 0 .   
Stage at diagnosis
 I 25.67 <.0001 42.13 <.0001
 II 8.47 0.0013 14.03 0.031
 III 11 <.0001 23.98 0.0001
 IV 0 . 0 .
Charlson Comorbidity Score
 0 0 . 0 .
 1 5.13 0.0371 19.21 0.0025
 ≥ 2 31.86 <.0001 82.24 <.0001
GI comorbidity
 No 6.4 0.0014 29.18 <.0001
 Yes 0 . 0 .
Usual Provider Continuity
 < 3 primary care visits 4.52 0.35 13.54 0.39
 Low < =50% 5.47 0.07 18.34 0.0046
 Medium 5080% 4.87 0.06 11.64 0.0269
 High >80% 0 . 0 .
# of GP visits
 0–1 0 . 0 .
 2 44.13 <.0001 91.45 <.0001
 ≥ 3 140.8 <.0001 201.59 <.0001
# of GI specialist visits
 0 0 . 0 .
 1 33.46 <.0001 50.68 <.0001
 ≥ 2 108.54 <.0001 153.56 <.0001
# of non-GI specialist visits
 0 0 . 0 .
 ≥ 1 81.55 <.0001 101.56 <.0001
# of endoscopy
 0 17.44 <.0001 52.66 <.0001
 1 0 . 0 .
 ≥ 2 36.05 <.0001 50.43 <.0001
  1. The unconditional percentiles corresponded to diagnostic interval cut-off values are Q0.50 = 79 and Q0.75 = 206 days