Among boys of the same age, those one year above normal grade average both heavier and taller than boys of normal grade, and in some cases boys one year below normal also average heavier and taller¶

Claim · All claims
Evidence · 1 study (2 entries) · associational r1 · q2
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? For any given age, boys one year above the normal grade average heavier than boys of the normal grade, and except at fifteen and seventeen years boys one year below normal also average heavier. → Stewart 1917 q2 i? For any given age, boys one year above the normal grade average taller than boys of the normal grade, with similar exceptions at fifteen and seventeen years for boys below normal. → Stewart 1917 (2)

Evidence¶

Stewart 1917¶

Stewart, S. F. (1917). A study of physical growth and school standing of boys. The Journal of Educational Psychology. https://doi.org/10.1037/h0070804

q2 · i? · associational · r1

Observational analysis of 583 weights distributed by ages and school grades (Chart I) for University of Chicago boys, 1906-7 to 1913-14. The text states "the boys one year above the normal grade average heavier than the boys of the normal grade," with exceptions at fifteen and seventeen years.

"For any given age, the boys one year above the normal grade average heavier than the boys of the normal grade. Also, except for fifteen and for seventeen years, the boys one year below the normal grade average heavier than the boys of the normal grade."

Stewart 1917 (2)¶

Stewart, S. F. (1917). A study of physical growth and school standing of boys. The Journal of Educational Psychology. https://doi.org/10.1037/h0070804

q2 · i? · associational · r1

Observational analysis of 581 heights distributed by ages and grades (Chart II) in the same sample. The interpretation parallels the weight chart: above-normal-grade boys "average taller than boys of the normal grade," with exceptions at ages 15 and 17.

"For any given age, boys one year above the normal grade average taller than boys of the normal grade. Also, except for 15 and for 17 years, the boys one year below the nor- mal grade average taller than boys of the normal grade."

Discussion¶

Related Claims¶

• Groups one year ahead of normal grade increase more rapidly in both weight and height than normal groups of the same age, with one exception — a broader claim this one bears on
• In a same-age, same-class group of eight boys followed through high school, the higher-scholarship half averaged taller in all four years and heavier in all years except the junior year — related
• Group averages are misleading when applied to individual pupils because of extensive overlapping in weight and height across grades — related