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Assurance de qualité pour le cancer rectal – phase 2 ...

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KCE Reports 81 PROCARE <strong>–</strong> <strong>phase</strong> 2 99APPENDIX 2: ALGORITHMS OF SELECTEDQUALITY INDICATORSOVERALL 5-YEAR SURVIVAL AND DISEASE-SPECIFIC 5-YEARSURVIVAL (FIGURE 21)For the calculation of survival statistics, it is essential to inclu<strong>de</strong> only those patients witha follow-up of the date of <strong>de</strong>ath. Mortality data are col<strong>le</strong>cted from the mortalitydatabase of the sickness funds, and are availab<strong>le</strong> until December 31 st 2006 for thepresent study. Coupling with the PROCARE database is done using the social securitynumber. Therefore, an accurate follow-up is only availab<strong>le</strong> for patients with a knownsocial security number and Belgian postal co<strong>de</strong>. Since no mortality data are availab<strong>le</strong> forpatients with a private insurance, the survival is probably overestimated.Above this, to calculate the survival period between the inci<strong>de</strong>nce date (see below forthe <strong>de</strong>finition of inci<strong>de</strong>nce date) and mortality date, it is of course essential to have theinci<strong>de</strong>nce date. Since mortality data are only availab<strong>le</strong> until December 31 st 2006, patientswith an inci<strong>de</strong>nce date after December 31 st 2006 are exclu<strong>de</strong>d.As explained in the scientific summary, the calculation of the disease-specific survival isimpossib<strong>le</strong> at present, and the relative survival (i.e. observed survival / expectedsurvival) is calculated as a proxy. Expected survival rates were retrieved from themortality tab<strong>le</strong>s of 2004 (http://statbel.fgov.be/pub/home_nl.asp#3) and were linked tothe individual patient, taking into account age, gen<strong>de</strong>r and region.Figure 21. Algorithm for QI 1111 - 1112 (PROCARE database).All patientsN=1071All info availab<strong>le</strong>N=1062Date of inci<strong>de</strong>nce≤ 31/12/2006N=866One of the following info missing?- National number- Inci<strong>de</strong>nce date- Belgian zipco<strong>de</strong>Date of inci<strong>de</strong>nce≤ 31/12/2006?Date of inci<strong>de</strong>nce> 31/12/2006N=196Info missingN=9

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