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Data collection Practice nurses received an instruction folder containing the names of all PPI preparations available in Germany.
For each dimension (weight, height and BMI), the ICC with index measurements were higher in the group of children whose parents measured their body parameters at home according to the instruction folder than in the children in the control group.
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The final instruction folders are available in online supplementary annexes 1 and 2. Written informed consent from the child's parent and the staff member performing the measurements in the attached instruction folders was obtained prior to photography.
Instruction folders illustrating and describing how to measure children's weight and height at home were developed in close collaboration with paediatricians and experts in anthropometric measurements.
12 14 The parents in the intervention group were asked if they had used the instruction folders (online supplementary annexes 1 and 2) during the measurements or not.
Only 63% of the intervention group parents reported they made the effort to measure their child's weight and height according to the instruction folders distributed.
To our knowledge no other studies have evaluated the validity of instruction folders to improve the validity of parent-reported weight and height measurements further.
These patterns are reflected in the relative values of the weighted κ statistics, being highest (0.60) for the group of children whose parents reported using the instruction folders to measure their child's weight and height.
After training in the study recruitment processes, clinicians are given participant study packs, vial stands, practice and clinician instruction folders and clinician specific logon details for the online study database and are able to commence recruitment.
Correlations remained higher for the intervention group than the control group, and were highest in the group of children from the intervention group whose parents used the instruction folders (data not shown).
Mean differences between means of parent reported and measured BMI were, however, not significantly different from index measurements when parents measured their child's weight and height according to the instruction folders distributed in the intervention group.
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