Fig. 3From: A multicenter retrospective study of heterogeneous tissue aggregates obstructing ventricular catheters explanted from patients with hydrocephalusA Distribution of patient age at the time of first surgery across the three ventricular catheter (VC) obstruction classes. B Distribution of the length of time for which the patients have had the VC placed in their ventricular space before revision. Horizontal line indicates arithmetic mean, and error bars show one SD standard deviation above mean. Differences between groups were assessed using Kruskal–Wallis’s test with Dunn’s multiple comparisons test, *P < 0.05Back to article page