These findings are consistent with those of the present study. These results are consistent with the results of previous studies 2 , 12 , 17 — 21 that reported that insufficient weight gain during pregnancy increases the risk of SGA and preterm delivery. Introduction In the United States and many other developed countries, the increasing prevalence of obesity in pregnant women is regarded as a problem. On the contrary, the problem in Japan is the number of young women who are underweight. This indicates that in Japanese underweight women, a GWG of National Center for Biotechnology Information , U. Because this study used anonymized databases in which the opt-out consent method was adopted, obtaining informed consent from individuals was not required. Even when the results were adjusted using e-GWG, there was a statistically significant difference.
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