@article{oai:kokushikan.repo.nii.ac.jp:00015080,
 author = {KUBOYAMA, Izumi and MAKI, Akira and YAMAGUCHI, Yoshikazu and ASHIZAWA, Takeshi and TAKEUCHI, Hidekazu and ITO, Susumu},
 journal = {国士舘大学体育研究所報, The annual reports of health physical education and sport science},
 month = {Mar},
 note = {J-GLOBAL ID : 200901011395643320, J-GLOBAL ID : 200901020496650173, J-GLOBAL ID : 200901022307261032, J-GLOBAL ID : 201401044250841766, J-GLOBAL ID : 201901004235578760, J-GLOBAL ID : 200901012516528555, Background
　Babies with low birthweight have potential physical and mental disadvantages.
Purpose
　The purpose of this study was to determine the social and demographic variables (SDVs) related to the low birthweight rate (LBWR) in Japan using a combination of the correlation coefficient (CC) and coefficient of determination (R2)．
Methods
　We obtained 704 variables from 13 statistical tables in the SDVs of the 2017 e-Stat database of Japan. We calculated the CCs between the LBWR and the 704 variables in each Japanese prefecture. Of the original 704 variables, 21 were selected, as the CCs between the LBWR and variables were ≥0.4. We conducted multiple regression analysis between the LBWR and these 21 variables to obtain a list of 21 explanatory variables in ascending order by p-value. We also repeated the multiple regression analysis 21 times to obtain the R2 and adjusted R2.
Results
　The median LBWR was 9.5%, the maximum was 11.5%, the minimum was 8.2%, and the mean was 9.5% among 47 prefectures. Only the variable amount of saving per household” exhibited statistical significance (p＝0.048)， and its R2 and R2adj were 0.164 and 0.149, respectively. The R2 was 0.669 (88.3% of the maximum)， and the R2adj was 0.610 (95.3% of the maximum) and the maximum in seven explanatory variables that reached the plateau.
Conclusion
　The combination of CCs and R2 indicated that the LBWR was significantly related to the regional factor “amount of savings per household,” as determined from the social and demographic database in Japan., application/pdf},
 pages = {17--24},
 title = {Selection of regional factors associated with low birthweight in Japan},
 volume = {38},
 year = {2020}
}