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Seven RCTs of Ripple Effects have collected data on GPA. Ripple Effects students had statistically significant increases in GPA compared to the control group, in 4 of the 7 studies. Ripple Effects students had grades that ranged from one-third to nearly a full point higher, on a four point scale. Effect sizes (Cohen’s d) ranged from .42 to 1.01.
Where prior year baseline data was available, treatment students had a higher GPA by from .12 to 1.5 points.
Other academic outcome data
In a pilot RCT in New York (Stern & Repa, 2000), Ripple Effects students had 42% fewer referrals to remedial summer school than control students, a substantive, but not statistically significant, difference.In a quasi-experimental study in LAUSD, students who participated in a 4-part intervention, of which Ripple Effects was one component, showed an 8% increase in Degrees of Reading Power scores from pre-to-post intervention.
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