Kaplan Meier long-term survival estimates for the study population (n = 1207) according to completeness of follow-up.

<p>Scenario A (blue curve) estimated survival based on registry data, which, although collected prospectively during clinical routine, were not up to date for every patient at the study end. Scenario B (red curve), however, estimated survival of the same study population based on a comprehensive survey performed at the study end. Completeness of follow-up differed significantly between scenarios as expressed as follow-up index (FUI, see text). Thereby, scenario A (FUI 0.57±0.35) underestimated effective mortality by almost 30% (scenario B; FUI 1.0±0).