The two fifth-grade classes were equivalent at baseline: Room 18 led on half of the ten non-physical tests before treatment¶

Claim · All claims
Evidence · 1 study · causal r2 · q2
Currency · newest study 1913 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Before dental treatment, the untreated class led five times out of ten tests, indicating baseline parity between the classes. → Emma Kohnky 1913

Evidence¶

Emma Kohnky 1913¶

Emma Kohnky, M.A. (1913). Preliminary Study of the Effect of Dental Treatment upon the Physical and Mental Efficiency of School Children. The Journal of Educational Psychology. https://www.jstor.org/journal/jeducpsych

q2 · i? · causal · r2

Baseline comparison from the study's concluding tabulation: the untreated class (Room 18) led on five of ten tests at the October pretest. The author interprets this as evidence the classes' abilities were initially equal. Descriptive medians only; no statistical test is reported.

"Room 18 led five times out of a possible ten when the tests were given first, so that its ability would seem to be equal with that of the treated class."

Discussion¶

Related Claims¶

• After one school year, the dental-treatment class led in nine of ten psychological and psycho-physical tests, having led in only five of ten before treatment — reports the opposite
• On the cancellation test the untreated class led before and after treatment, an exception attributed to the time limit — related
• The treated class showed greater gains in tapping endurance, leading in endurance on both hands by the second test despite greater initial fatigue — related