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Evaluating the seasonality of growth in infants using a mobile phone application.


ABSTRACT: It has been observed that growth velocity of toddlers and school children shows seasonal variation, while such seasonality is unknown in infants. The aim of this study was to examine whether growth velocity (length and weight) of infants differs by seasons. We assessed longitudinal measurement data obtained for 9,409 Japanese infants whose parents used the mobile phone application, "Papatto Ikuji", during the period from January 2014 to October 2017. On average, each infant had 4.8 entries for length and 5.4 entries for weight. The mean daily change in sex- and age-adjusted z-scores between two time points was estimated as the growth velocity during that period: ?LAZ/day and ?WAZ/day for length and weight, respectively. We analyzed 20,007 ?LAZ/day (mean, -0.0022) and 33,236 ?WAZ/day (mean, 0.0005) measurements, and found that ?LAZ/day showed seasonal differences with increases during summer. We conducted a multilevel linear regression analysis, in which effects of age, sex, nutrition and season of birth were adjusted, showing significant difference in ?LAZ/day between winter and summer with a mean ?LAZ/day difference of 0.0026 (95%CI 0.0015 to 0.0036; P?P?

SUBMITTER: Narumi S 

PROVIDER: S-EPMC7578091 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Evaluating the seasonality of growth in infants using a mobile phone application.

Narumi Satoshi S   Ohnuma Tetsu T   Takehara Kenji K   Morisaki Naho N   Urayama Kevin Y KY   Hattori Tomoyuki T  

NPJ digital medicine 20201021


It has been observed that growth velocity of toddlers and school children shows seasonal variation, while such seasonality is unknown in infants. The aim of this study was to examine whether growth velocity (length and weight) of infants differs by seasons. We assessed longitudinal measurement data obtained for 9,409 Japanese infants whose parents used the mobile phone application, "Papatto Ikuji", during the period from January 2014 to October 2017. On average, each infant had 4.8 entries for l  ...[more]

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