Increases in the percentage of students in the Harlem Fitness Zone were generally larger for boys than for girls¶

Claim · All claims
Evidence · 1 study · causal r? · q2
Currency · newest study 2018 · checked against its sources 2026-10-08 (automated, 1 of 1 entry) · not reviewed by a person

Subclaims¶

Reading the evidence codes

q is the design tier, i the impact, n the sample, and the kind with its r the rigour judged within that kind: what each code means.

This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.

q2 i? The increased percentage of students in the HFZ was generally larger for boys than girls. → Martha Bleeker 2018

Evidence¶

Martha Bleeker 2018¶

Martha Bleeker, James Mabli, Mary Kay Fox, Betina Jean-Louis, Marlene Fox. (2018). The Impact of Healthy Harlem on Student Fitness Outcomes after Two and Three Years. Princeton, NJ: Mathematica Policy Research. https://www.mathematica.org/publications/the-impact-of-healthy-harlem-on-student-fitness-outcomes-after-two-and-three-years

q2 · i? · causal · r?

Moderator finding from the Healthy Harlem evaluation brief: among students in the targeted Harlem Fitness Zone after two and three years of participation, the increase relative to baseline was "generally larger for boys than girls"; no effect size or test statistic is printed.

"The increased percentage of students in the HFZ was generally larger for boys than girls."

Discussion¶

Learner Variables¶

Gender — moderator: an instructional effect differs by group
Physical Well-Being — outcome: instruction changes it

GenAI function, intervention duration, publication year, and gender were not significant moderators of GenAI's motivational effect — the general claim this finding bears on, with the studies behind it
Healthy Harlem generally increased students' fitness levels, with variation by gender — a broader claim this one bears on
The percentage of students in the targeted Harlem Fitness Zone was significantly greater after two and three years of participation than at baseline — related
Healthy Harlem had some positive impacts on other measures of student self-efficacy and social support — related
Healthy Harlem increased students' nutrition knowledge and physical-activity self-efficacy, with gains sustained over three years — related
Playworks showed significant impact on some measures of girls' physical activity but no significant impact on measures of boys' physical activity — related
No significant gender differences in knowledge pretest scores or learning gains after Web-based collaborative inquiry — related

Page metadata

Field	Value
`type`	`claim`
`id`	`healthy-harlem-hfz-gains-larger-for-boys`
`title`	`Increases in the percentage of students in the Harlem Fitness Zone were generally larger for boys than for girls`
`description`	`Increases in the percentage of students in the Harlem Fitness Zone were generally larger for boys than for girls`
`status`	`review`
`evidence_strength`	`weak`
`newest_evidence`	`2018`
`source_checked`	`2026-10-08`
`generated`	by `process:wiki-ingest` on `2026-10-08`
`trust`	unverified — no one has confirmed this page's content
`sources`	1 — `martha-bleeker-2018`

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