Fig 1.
Map of the distribution of standardized heights and weights of Japanese youth.
Map of the distribution of the 25-year (1989 to 2013) average of standardized heights and weights of the following subject groups, in each prefecture: (A) Heights of 12-year-old boys, (B) weights of 12-year-old boys, (C) heights of 12-year-old girls, and (D) weights of 12-year-old girls.
Table 1.
Basic statistics for standardized heights and weights.
Fig 2.
Map of the distribution map of effective day length in Japan.
Mesh Climatic Data 2000 for 380,000 1-km2 mesh areas are shown. The fill color in the mesh areas indicates the annual mean effective day length at 5000 lux (h/day). The latter tend to be relatively low in northern areas along the Sea of Japan.
Table 2.
Basic statistics for climatic variables.
Table 3.
Pearson’s correlation coefficients for the relationship between height, weight, and effective day length.
Table 4.
Regression coefficients (standard errors) of predictors of height (boys).
Table 5.
Regression coefficients (standard errors) of predictors of height (girls).
Table 6.
Regression coefficients (standard errors) of predictors of weight (boys).
Table 7.
Regression coefficients (standard errors) of predictors of weight (girls).
Fig 3.
Relationship between standardized heights and weights.
The relationship between standardized heights and weights in 12-year-old boys. The length of the standardized annual mean effective day length at 5000 lux is indicated by the size of the plot.