JRSM >
Volume 99, Number 5 >
Pp. 250-257
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Figure 2. Measured (National Health and Nutrition Examination Survey [NAHNES]) and
self-reported (NHANES in-person and Behavioral Risk Factor Surveillance System
[BRFSS] telephone) height and weight by age and sex. Each data point shows
the 95% confidence (CI) for estimated body mass index as two horizontal lines.
When the 95% CI is small, the two horizontal lines appear to overlap. This is
particularly the case for BRFSS (shown in red), which has very large sample
size. For each survey, a local (non-parametric) regression was used to
estimate the age pattern, shown as solid lines.
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