> Main difference shown was ~30% reduction in sick days they took. That's actually not quite the conclusion. Verbatim: > Repetitive cold showering can modul

> Main difference shown was ~30% reduction in sick days they took. That's actually not quite the conclusion. Verbatim: > Repetitive cold showering can modulate the physiological > response.[3] Our findings show that routinely showering > (hot-to-) cold for at least 30 days resulted in a reduction > of self-reported sick leave from work but not illness days > in adults without severe comorbidity. combined with > 79% of participants in the interventions groups completed > the 30 consecutive days protocol. The protocol was randomized exposure to cold showers. Presumably the control group had no recommended exposure to cold showers. So, one explanation might be that the group able to successfully complete the study is a self-selecting group that may have stronger resistance to physical discomfort that they would also take fewer sick leave days despite feeling sick. Whereas, individuals unable to complete the study are not as tolerant of physical discomfort and, so, are more likely to take sick days when feeling sick. I really would like to know what constitutes a control group for this study. To my mind, cold showers and sick days seem likely to be loosely correlated. This study does not seemed designed to determine whether people who take cold showers actually get sick less often than those who take hot showers. EDIT: spelling