Pascal Haegeli and coauthors’ interpretation of their avalanche research findings is unjustified.1 The authors cannot show an association between survival times and cause of death because cause of death is not reported in the Swiss sample. An association to snow density can’t be shown because it was not measured. The data show that the victims in both cohorts differed in many aspects and much potentially relevant information seems not to have been available to the authors. Because of this lack of data the authors’ rather causal conclusions are not sufficiently supported. Apart from the missing data on snow and causes of death much more information on covariates would be necessary to address confounding in a convincing way.