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Research Papers

Consideration of Demographics and Variance in Regression Approaches to Estimating Body Dimensions for Spatial Analysis of Design

[+] Author and Article Information
Gopal Nadadur

Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802gzn103@psu.edu

Matthew B. Parkinson

Engineering Design Program, Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802parkinson@psu.edu

J. Mech. Des 132(2), 021007 (Jan 26, 2010) (8 pages) doi:10.1115/1.4000831 History: Received March 07, 2009; Revised December 01, 2009; Published January 26, 2010

A common objective in designing for human variability is to consider the variability in body size and shape of the target user population. Since anthropometric data specific to the user population of interest are seldom available, the variability is approximated. This is done in a number of ways, including the use of data from populations that are well-documented (e.g., the military), proportionality constants, and digital human models. These approaches have specific limitations, including a failure to consider the effects of lifestyle and demography, resulting in products, tasks, and environments that are inappropriately sized for the actual user population, causing problems with safety, fit, and performance. This paper explores a regression-based approach in a context where the demographic distributions of descriptors (e.g., race/ethnicity, age, and fitness) are dissimilar for the database and target population. Also examined is a stratified regression model involving the development of independent anthropometry-estimation models for each racial group. When using regression with residual variance, stratification on the predictor demographics to obtain estimates of gender, stature, and BMI distributions is shown to be sufficiently robust for usual database-target population combinations. Consideration of demographic variables in development of the regression model provides marginal improvement, but could be appropriate in specific situations.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

A comparison of the race/ethnicity composition of the CAESAR, ANSUR, and unweighted and weighted NHANES data collected from 2003–2006 databases

Grahic Jump Location
Figure 2

Variation in the probability densities of stature, BMI, sitting height, and hip breadth in the non-Hispanic White and non-Hispanic Black populations of ANSUR and CAESAR

Grahic Jump Location
Figure 3

A flowchart illustrating five methods for obtaining estimates of detailed body dimensions for a target user population from demographic information and detailed and representative databases

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