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Nutrition knowledge was assessed using the Nutrition Knowledge Questionnaire, the development of which is described elsewhere (Parmenter and Wardle, 1999).
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In order to obtain reliable and valid questionnaires, the development process has been prescribed in a manual and it is guided and controlled by a scientific advisory board.
TPB questionnaire 15 16: the development of the questionnaire is described in online supplementary appendix 1.
The only previously published study including the AKQoL questionnaire describes the development and validation of the questionnaire [ 14].
After completing all the procedures for the questionnaire development, the questionnaire was distributed to the targeted audiences.
The findings from this phase of the study further informed modifications to the questionnaire and the development of the final version of the RAD.
SJ elaborated the methodology of the study including the questionnaire development, managed the data assessment and carried out the expert interviews.
Through the use of quantitative evaluation and empirically-based item reduction, this prospective observational study successfully reduced the pool of 37 items generated from the qualitative phase of the questionnaire development to the final 13-item daily questionnaire.
The type of constructs and variables used in the questionnaire development, the way these constructs and variables are operationally defined, the self-reported nature of the collected data, and the type of data analyses carried out all may contribute to explaining the difficulty of finding strong associations between students' performance and process-related school variables.
After the necessary corrections were made, a pilot study was performed with 10% of the source population for the final test of the questionnaire, development of the manual of instructions, and training of interviewers.
It should be noted, however, that the statistical testing of the questionnaire should guide the development and not dictate which items remain in the questionnaire.
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