| Total (N = 7033) | AP resection (N = 727) | Random-effect model‡ | ||
---|---|---|---|---|---|
 | No. | % | OR | (95% CI) | P |
Age (years) | Â | Â | Â | Â | Â |
 ≤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 | Â | Â | Â | Â | Â |
 Male | 4,275 | 23.0 | 1 |  | 0.002 |
 Female | 2,758 | 19.9 | 0.78 | (0.69-0.89) |  |
Educational level | Â | Â | Â | Â | Â |
 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 | Â | Â | Â | Â | Â |
 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 | Â | Â | Â | Â | Â |
 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) | Â | Â | Â | Â | Â |
 0 | 5,174 | 21.5 | 1 |  | 0.24 |
 ≥1 | 1,859 | 22.8 | 1.01 | (0.89-1.16) |  |
Year of admission | Â | Â | Â | Â | Â |
 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) | Â | Â | Â | Â | Â |
 >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) |  |