Motion sickness incidence: distribution of time to first emesis and comparison of some complex motion conditions.
A statistical mixture model is used to fit time-to-emesis data. The Weibull probability distribution is shown to provide a good fit for those subjects who either become sick or withdraw from the experiment within 2 h. The second part of the mixture accounts for those subjects who neither quit nor vomit within 2 h. The log-normal probability model is shown to give a poorer fit to the data and figures showing the relative fits of the estimated Weibull and log-normal distributions are provided. A nonparametric test is used to compare the five motion conditions of the Correlation Study. That test shows that there are significant differences in severity among the conditions.
D006801:Humans; D008954:Models, Biological; D009038:Motion; D009041:Motion Sickness / Q000503:physiopathology*; D009326:Naval Medicine; D013223:Statistics as Topic; D013997:Time Factors; D014839:Vomiting / Q000503:physiopathology*