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- W2140920171 abstract "To improve an existing measure of fruit and vegetable intake self efficacy by including items that varied on levels of difficulty, and testing a corresponding measure of water intake self efficacy. Cross sectional assessment. Items were modified to have easy, moderate and difficult levels of self efficacy. Classical test theory and item response modeling were applied. One middle school at each of seven participating sites (Houston TX, Irvine CA, Philadelphia PA, Pittsburg PA, Portland OR, rural NC, and San Antonio TX). 714 6th grade students. Adding items to reflect level (low, medium, high) of self efficacy for fruit and vegetable intake achieved scale reliability and validity comparable to existing scales, but the distribution of items across the latent variable did not improve. Selecting items from among clusters of items at similar levels of difficulty along the latent variable resulted in an abbreviated scale with psychometric characteristics comparable to the full scale, except for reliability. The abbreviated scale can reduce participant burden. Additional research is necessary to generate items that better distribute across the latent variable. Additional items may need to tap confidence in overcoming more diverse barriers to dietary intake." @default.
- W2140920171 created "2016-06-24" @default.
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- W2140920171 date "2010-01-01" @default.
- W2140920171 modified "2023-10-13" @default.
- W2140920171 title "Self efficacy for fruit, vegetable and water intakes: Expanded and abbreviated scales from item response modeling analyses" @default.
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- W2140920171 doi "https://doi.org/10.1186/1479-5868-7-25" @default.
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