Originally Posted by
T-Vasis
And there will likely never be any gold standard randomised control studies because for this type of study you need a very large number of people over a very long time for which you can control for so many variables. All you will be able to do is observational epidemiology studies at best, which, can't prove causality. Only correlation or association at best - but easily picked apart (when convenient).
Agreed.
Most Airlines are not interested in a longitudinal study of extended duration as negative health outcomes impact their commercially driven spreadsheet models.
There are airlines that accept the causal link between sleep disturbance, circadian rhythm upset and illness.
The last thing Qantas IR would want is an examination of long term sick leave.