![]() Bland-Altman analysis revealed potential proportional bias for vitamin A. Samsung Health had the greatest variation of correlation, with energy at r=.79. Noom Coach was limited to energy output, but it had a high correlation with Dietplan6 ( r=.91). Correlation coefficients ranged from r=–.12 for iron (Samsung Health vs Dietplan6) to r=.91 for protein (FatSecret vs Dietplan6). We observed no other significant differences between Dietplan6 and the apps. Samsung Health and MyFitnessPal significantly underestimated calcium, iron, and vitamin C compared with Dietplan6, although there was no significant difference for vitamin A. Lose It! also gave significantly lower estimates for other reported outputs (carbohydrate, fat, fiber, and sodium) than did Dietplan6. ![]() ![]() Estimates of protein and sodium intake were significantly lower using Lose It! and FatSecret than using Dietplan6. The difference in estimation of energy and saturated fat intake between Dietplan6 and the diet apps was not significant.
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