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Table 3 Abdominoperineal (AP) resection* versus other resections (reference group) in 7,033 incident rectal cancer patients

From: Hospital factors and patient characteristics in the treatment of colorectal cancer: a population based study

  Total (N = 7033) AP resection (N = 727) Random-effect model
  No. % OR (95% CI) P
Age (years)      
 ≤60 1,342 17.4 1   <0.001
 61-70 2,083 20.7 1.10 (0.91-1.33)  
 71-80 2,536 23.9 1.30 (1.08-1.56)  
 >80 1,072 24.6 1.38 (1.11-1.71)  
Gender      
 Male 4,275 23.0 1   0.002
 Female 2,758 19.9 0.78 (0.69-0.89)  
Educational level      
 Secondary or more 969 17.7 1   <0.001
 Intermediate 1,516 19.2 1.11 (0.90-1.38)  
 Primary 3,796 23.9 1.40 (1.16-1.70)  
 Unknown 752 22.1 1.29 (0.97-1.70)  
Marital status      
 Married 4,651 21.3 1   0.002
 Unmarried§ 1,854 24.2 1.17 (1.02-1.35)  
 Unknown 528 17.6 0.83 (0.63-1.10)  
OPE      
 No 5,437 22.5 1   0.05
 Yes 1,596 19.6 0.87 (0.75-1.01)  
Disease staging      
 Absence of metastases 6,180 21.8 1   0.82
 Presence of metastases 853 22.3 1.11 (0.93-1.32)  
Comorbidity (Charlson index)      
 0 5,174 21.5 1   0.24
 ≥1 1,859 22.8 1.01 (0.89-1.16)  
Year of admission      
 2000 861 23.0 1   0.04
 2001 887 23.9 1.12 (0.89-1.41)  
 2002 789 23.7 1.06 (0.84-1.35)  
 2003 825 19.1 0.87 (0.68-1.11)  
 2004 961 20.0 0.92 (0.73-1.16)  
 2005 906 22.2 1.02 (0.80-1.28)  
 2006 923 23.4 1.08 (0.86-1.36)  
 2007 881 19.4 0.85 (0.67-1.09)  
Hospital volume (annual caseload)      
 >25 3,688 20.6 1   0.001
 11-25 2,560 22.1 1.03 (0.81-1.31)  
 ≤10 785 26.6 1.37 (1.03-1.82)  
  1. *ICD9: 48.5, 48.62. ICD9: 45.4x-45.8x, 48.3x-48.4x, 48.61, 48.63-48.69.
  2. Cases with obstruction or perforation or in emergency admission were classified in the OPE category.
  3. §Unmarried includes single, separated, divorced and widowed.
  4. OR: odds ratio, CI: confidence interval, APR-DRG: all-patient-refined-diagnosis-related group, OPE: obstruction, perforation or emergency admission.