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Table 2 Clusters identified over space and time

From: Does emergency department use and post-visit physician care cluster geographically and temporally for adolescents who self-harm? A population-based 9-year retrospective cohort study from Alberta, Canada

Cluster Time Frame Location (sRHA) Population Cases Expected Cases Observed/Expected Relative Risk p-value
1 April 2002 to March 2006 27 Clearwater 59,652 (a) 1,027 717.84 1.43 1.58 <0.001
28 Brazeau (b) 612 393.55 1.56 1.78 <0.001
  29 Wetaskiwin-Hobbema        
  41 St. Albert        
  42 Edmonton Castle Downs        
   43 Edmonton Woodcroft        
   44 Edmonton Eastwood        
   45 Edmonton North Central        
   46 Edmonton North East        
   47 Edmonton Bonnie Doon        
   48 Edmonton West Jasper Place        
   49 Edmonton Twin Brooks        
   50 Edmonton Mill Woods        
   51 Sherwood Park        
   52 Strathcona County        
   53 Thorsby        
   54 Leduc Office        
   55 Beaumont        
   56 Westview        
   57 Sturgeon County        
   58 Fort Saskatchewan        
   59 Aspen West        
   60 Aspen Central        
   61 Aspen North        
   63 Peace NW        
   64 Peace NE        
   65 Peace SE        
   66 Peace SW        
2 April 2003 to March 2007 1 Crowsnest Pincher Creek 620 (a) 28 7.94 3.53 3.54 <0.001
(b) 18 4.35 4.14 4.17 0.006
  1. sRHA sub-Regional Health Authority
  2. Legend: (a) adolescents with ED visits for self-harm; (b) adolescents without a 14-day physician follow-up after an ED visit for self-harm