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The same pattern was found for response capability for height.
When analysing the combined measure for response capability for weight having 'weighed recently + high recall ability' as the reference group all remaining combinations of weighing history and recall ability show a significantly larger underestimation of weight.
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The same pattern was seen for the combined measure of response capability for height (data not shown).
For the concept of response capability a number of assumptions are made.
Compared to girls 'being weighed recently + having high recall ability' all three remaining combinations of response capability for weight significantly underestimated weight (significant interaction with gender: p = 0.0033).
The results therefore indicate that integrating measures of response capability for weight and height among adolescents in questionnaire surveys may be appropriate for identifying adolescent girls with an increased risk of reporting erroneous information on weight.
The present study is however the first of its kind and additional studies in other and less selected populations are needed to generate a more general picture on the influence of response capability for reporting height and weight among adolescent boys and girls.
Analyses of the distribution of missing values by the combined measure of response capability for weight showed that the proportion of missing values was high when students reported low recall ability irrespectively of when they were last weighed (approximately 20% compared to 5-10% in the groups of students with high recall ability).
In analyses of all operationalizations of response capability the largest standard deviation of mean difference for weight were seen among students with low response capability indicating a lower reporting precision (random measurement error).
In analyses of all operationalizations of response capability the largest standard deviation of mean difference for height were seen among students with low response capability indicating a larger random measurement error.
Here, the association between the independent variables weighing/height measure history, recall ability for weight/height, response capability for weight/height and BMI response capability and the dependent variables difference between self-reported and direct measures of weight, height and BMI z-score were analysed, respectively.
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