HIS-based Kaplan-Meier plots - a single source approach for documenting and reusing routine survival information

Table 4 Completeness of survival data

Attribute	Therapy start date	Follow-up Status	Follow-up date	All three available
Routine cases	207
Available	204	207	183	180
Completeness	98.5%	100%	88.4%	86.6%
Retrospective Cases	758
Available	738	743	727	701
Completeness	97.3%	98%	95.9%	92.4%
Total Cases	965
Available	942	950	910	881
Completeness	97.6%	98.5%	94.3%	91.3%

Completeness was measured for routine cases (207) and retrospective cases (758) separately. In total therapy date and follow-up status is relatively complete for all patients (> 97%), follow-up date was available for 94.3% of the patients. Imprecise date items (follow-up month and follow-up year available) are considered. Survival information was available for 91.3% of the patients.

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