Fig. 2From: Endotracheal tube microbiome in hospitalized patients defined largely by hospital environmentAlpha diversity comparisons. Violin plots showing community alpha diversity according to hospital (a) and extubation reason (b). Statistical differences based on ICU were assessed with Welch t-test (Shannon: p = < 0.001, Chao1: p = 0.0056, Simpson p = 0.001, OTUs observed: p = 0.0010), and with One-way ANOVA for extubation reason (Shannon: p = < 0.0305, Chao1: p = 0.0343, Simpson p = 0.0278, OTU number: p = 0.0215. c Intubation (top) and patient age (bottom) were tested for correlation using Spearman’s rank correlation coefficient (rho). Statistical differences were observed only for intubation days (Shannon: p = < 0.001, Chao1: p = 0.0001, Simpson p = 0.0009, OTUs observed: p = 1.391e−05)Back to article page