000			03105nam a2200241Ia 4500
008			200306s2018 xx 000 0 und d
100			_aBean, Melanie K.
245		0	_aReliability and validity of digital imagery methodology for measuring starting portions and plate waste from school salad bars / _cMelanie K. Bean, Hollie A. Raynor, Laura M. Thornton, Alexandra Sova, Mary Dunne Stewart, Suzanne E. Mazzeo Hollie A. Raynor, Laura M. Thornton, Alexandra Sova, Mary Dunne Stewart, Suzanne E. Mazzeo
260			_cAugust 2018
336			_atext
337			_aunmediated
338			_avolume
440			_n118 : 8, page 1482-1489 _aJournal of the Academy of Nutrition and Dietetics
520			_aBackground Scientifically sound methods for investigating dietary consumption patterns from self-serve salad bars are needed to inform school policies and programs. Objective To examine the reliability and validity of digital imagery for determining starting portions and plate waste of self-serve salad bar vegetables (which have variable starting portions) compared with manual weights. Design/methods In a laboratory setting, 30 mock salads with 73 vegetables were made, and consumption was simulated. Each component (initial and removed portion) was weighed; photographs of weighed reference portions and pre- and post-consumption mock salads were taken. Seven trained independent raters visually assessed images to estimate starting portions to the nearest ¼ cup and percentage consumed in 20% increments. These values were converted to grams for comparison with weighed values. Statistical analyses Intraclass correlations between weighed and digital imagery-assessed portions and plate waste were used to assess interrater reliability and validity. Pearson's correlations between weights and digital imagery assessments were also examined. Paired samples t tests were used to evaluate mean differences (in grams) between digital imagery-assessed portions and measured weights. Results Interrater reliabilities were excellent for starting portions and plate waste with digital imagery. For accuracy, intraclass correlations were moderate, with lower accuracy for determining starting portions of leafy greens compared with other vegetables. However, accuracy of digital imagery-assessed plate waste was excellent. Digital imagery assessments were not significantly different from measured weights for estimating overall vegetable starting portions or waste; however, digital imagery assessments slightly underestimated starting portions (by 3.5 g) and waste (by 2.1 g) of leafy greens. Conclusions This investigation provides preliminary support for use of digital imagery in estimating starting portions and plate waste from school salad bars. Results might inform methods used in empirical investigations of dietary intake in schools with self-serve salad bars.
521			_aNutrition.
650			_aElementary school.
650			_aNutrition policy.
650			_aPlate waste.
650			_aSalad bars.
650			_aSchool lunch.
942			_2lcc _cA
998			_c84496 _d142859
999			_c80996 _d80996