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Background  As part of a sub-study in the ongoing Norwegian RCT ‘Fit for Delivery’, a new questionnaire, using a combination of food frequency, scale, and categorical questions to gather data on the diets and eating patterns of one year olds, was developed and tested for reliability by test-retest.    Results  Of 102 parents recruited to the study, 94 completed both test and retest. Correlation coefficients (Spearman’s r, and/or Cohen’s kappa, where applicable) were high for all categories of question, with a mean value of 0.72 for Spearman’s r for food frequency variables, and a mean value of 0.75 for Cohen’s kappa for non-numeric variables such as breast feeding status, showing very high test-retest reliability.    Conclusions  This newly developed diet and eating habit questionnaire had strong test-retest reliability in a test population similar to the study population, for which it was developed. This indicates that the questionnaire is reliable in this population.    Electronic supplementary material  The online version of this article (doi:10.1186/s13104-014-0966-y) contains supplementary material, which is available to authorized users.

Test-retest reliability of a new questionnaire on the diet and eating behavior of one year old children