Association between follow-up index (FUI) and the degree of underestimated mortality among ‘potential survivors’ (n = 1116).

<p>Patients were grouped into equally sized quartiles according to FUI (quartile 1 with highest FUIs; quartile 4 with lowest FUIs). After adjustment for potential confounding factors, underestimation of the actual mortality (i.e., inaccuracy of outcome estimate) correlated significantly with decreasing completeness of follow-up (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0140817#pone.0140817.t002" target="_blank">Table 2</a>).