Physical Growth of Children in South Korea in the Past Four Decades―Cross-Sectional Vs Longitudinal Data
1. Abstract Children Born in 2001 Grew to 1 Year Old (On Birth-Day) in 2002, 6 Years Old in 2007, —, 19 Years Old in 2020. They Didn’t Grow Instantly To 19 Years Old In 2002. Growth In Stature Is Longitudinal And Not Cross-Sectional In Nature.