Fig. 2.

Forest plot showing the incidence of chronic pain (pain (NRS ≥ 1) at day 90 in n = 825 patients for each center. The Haaglanden Medical Center location Bronovo and Westeinde are combined in this forest plot and named “HL” (n = 17 inclusions). Error bars indicate 95% Wilson score confidence intervals. Overall incidence is indicated by the vertical dashed line. The null-hypothesis that centers were different with respect to incidence was not rejected (Likelihood ratio test comparing a logistic regression model with centers included as covariates to an intercept only model, P = 0.339). Abbreviations: AM: Amsterdam University Medical Center location AMC, Amsterdam, AS: Albert Schweitzer Hospital, Zwijndrecht, ASD: Albert Schweitzer Hospital location Dordwijk, Dordrecht, CZ: Catharina hospital, Eindhoven, EM: Erasmus Medical Center, Rotterdam, FG: Franciscus Gasthuis, Rotterdam, FV: Franciscus Vlietland, Schiedam, HL: Haaglanden Medical Center location Bronovo and Westeinde, Den Haag, LU: Leiden University Medical Center, Leiden, MZ: Maasstad Hospital, Rotterdam, RG: Reinier de Graaf Hospital, Delft, VU: Amsterdam University Medical Center location VU, Amsterdam, ZL: Zuyderland Medical Center, Heerlen, ZLS: Zuyderland Medical Center, Sittard-Geleen