Designing for the Life Span Segment 4
Designing for the Life Span Segment 4 
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[D]
Distribution of Human Body Dimensions.
Basic Anthropometric Dimensioning.
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The traditional method of data collection and compilation relates body dimensioning to a standard distribution curve with the 50th percentile of all body dimensions representing the mode or maximum number of any single dimension. All other higher or lower numbers represent deviations from the modal number. In using percentiles in anthropometry, it is common practice to select a range of body dimensions to represent a population. In the automotive industry, standard practice has been to limit the range between the 5th percentile and 90th percentile, excluding 15% or more of the population. Since 100th percentile in standing height, for example, is 6'4" among males in all age segments combined, many more males are taller and also outside the range.
The methodology employed with use of population ranges has its shortcomings and can be exclusionary to significant numbers of individuals within a given population.
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