A statistical analysis of motion sickness

This paper analyzes motion sickness data obtained from questionnaires in one kindergarten, four primary schools, and one middle school; a total of 2484 pupils.These data were studied by Hayashi's quantification method II. which includes 13 items : age, sex, vertigo, orthostatic dysregulation, getting out of bed, sports, running, hearing loss, poor posture, headache, gasping, pallor, appetite.Motion sickness was the outside criterion.The quantification analysis indicated the following : 1) The correlation ratio, which indicates the rate at which items explain the outside criterion, was 0.102.2) The ranges of category weight, which are quantified to maximize the effect of grouping, were : age 1.175; appetite 0.888; sex 0.824; headache 0.671; and vertigo 0.563.3) Partial correlation coefficients which indicate a single relation between the outside criterion and each item (excluding influence of other items), were : age 0.170; sex 0.134; appetite 0.092; headache 0.072; and orthostatic dysregulation 0.056.4) From the cumulative distribution of sample scores (i.e. the sum of category weight in each case), motion sickness and non-motion sickness groups were discriminated at the rate of 65%.