Fig. 6From: Predicting medical usage rate at mass gathering events in Belgium: development and validation of a nonlinear multivariable regression modelValidation of the multivariable TTHR prediction model. a Temporal validation of regression tree with the 2018 dataset. b External validation of regression tree with other 2009–2016 manifestations. The solid red line represents a perfect match between the observed and predicted TTHR; the dotted red lines indicate 25% under- or overestimationBack to article page