NOTE: N = 552 students clustered in 18 intervention schools and 661 students clustered in 18 control schools. Generalized linear mixed models (SAS PROC GLIMMIX, Poisson distribution with log link function) were used to evaluate the program impact while accounting for the clustering of students within schools. Covariates in the model included gender, race/ethnicity, number of parents in household, and school size. Program impacts (with 95 percent confidence limits) were estimated via difference-in-difference models comparing change across time in the intervention versus control group. There are no statistically significant program impacts.
SOURCE: Student surveys limited to a high-risk subgroup of 6th-graders surveyed in fall 2006 and followed up in spring 2009.