Global Comparisons of Age, Gender and Socioeconomic Status Differences of Physical Fitness Health Risk in South African Primary School Children: Longitudinal Data from the NW-CHILD Study.

The low-SES group performed better in wall-sitting ( Figure 2 c) at all ages (2010–2016), although the group differences narrowed from 9 years, where they were still practically significant (d = 0.27) but not at 12 years (d = 0.09).

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