Validity of self‐reported height and weight and derived body mass index in middle‐aged and elderly individuals in Australia

Body mass index (BMI) is an important measure of adiposity. While BMI derived from self‐reported data generally agrees well with that derived from measured values, evidence from Australia is limited, particularly for the elderly. We compared self‐reported with measured height and weight in a random...

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Bibliographic Details
Published in:Australian and New Zealand journal of public health 2011-12, Vol.35 (6), p.557-563
Main Authors: Ng, Suan Peng, Korda, Rosemary, Clements, Mark, Latz, Isabel, Bauman, Adrian, Bambrick, Hilary, Liu, Bette, Rogers, Kris, Herbert, Nicol, Banks, Emily
Format: Article
Language:English
Subjects:
Accuracy
Adipose tissue
Adults
Aged
Aged, 80 and over
Aging
Aging - physiology
Agreements
Anthropometry
Australia
BMI
Body Height
Body Mass Index
Body size
Body Weight
Cohort analysis
Cohort Studies
Data
Exercise
Female
height
Humans
Indexes
Male
Middle age
Middle Aged
New South Wales - epidemiology
Nutrition
Obesity
Obesity - epidemiology
Older people
Overweight
Population studies
Public health
Reproducibility of Results
Self Disclosure
Self image
Self report
Sensitivity and Specificity
Socioeconomic factors
Surveys and Questionnaires - standards
Validity
Weight
Women
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Summary:Body mass index (BMI) is an important measure of adiposity. While BMI derived from self‐reported data generally agrees well with that derived from measured values, evidence from Australia is limited, particularly for the elderly. We compared self‐reported with measured height and weight in a random sample of 608 individuals aged ≥45 from the 45 and Up Study, an Australian population‐based cohort study. We assessed degree of agreement and correlation between measures, and calculated sensitivity and specificity to quantify BMI category misclassification. On average, in males and females respectively, height was overestimated by 1.24cm (95% CI: 0.75–1.72) and 0.59cm (0.26–0.92); weight was underestimated by 1.68kg (–1.99– ‐1.36) and 1.02kg (–1.24– ‐0.80); and BMI based on self‐reported measures was underestimated by 0.90kg/m2 (–1.09– ‐0.70) and 0.60 kg/m2 (–0.75– ‐0.45). Underestimation increased with increasing measured BMI. There were strong correlations between self‐reported and measured height, weight and BMI (r=0.95, 0.99 and 0.95, respectively, p
ISSN:1326-0200
1753-6405
DOI:10.1111/j.1753-6405.2011.00742.x