Impact evaluation of nutrition education intervention for an elementary school in riyadh city.

A nutritional education intervention (NEI) was conducted to assess its impact and suitability for the 5th and 6th graders at a governmental girls' elementary school in Riyadh city. The study design was a randomized posttest only control group. The results revealed that the mean knowledge score of the first posttest for intervention classes was higher than that of their controls (F=91.147, p<0.001). This score increased markedly among all classes at the post-posttest. The mean self-efficacy (SE) score of the control class of 5th graders and intervention class of 6th graders at posttest were much lower than that of their comparable classes and both classes showed significant increase of SE in the post-posttest (paired t=2.819 and 4.561, p<0.01 and p<0.001 respectively). The mean practice score of the posttest was lower among intervention class of the 5th graders than their control, but both means were much higher than that of both classes of the 6th graders (F=6.856, p<0.001). Only control class of the 6th graders showed increased mean practice score at the post-posttest. Stepwise linear regression models reveal that exposure to NEI session was a major predictor of students knowledge at posttest (R(2)=.345). Knowledge score was a predictor of students' dietary SE and practices scores at posttest (R(2)=.041 & .136). Self efficacy was a predictor of students' dietary practices at posttest and post-posttest (R(2)=.107 & .162) as well as lower body mass index (R(2)=.048). The study recommends the replication of such a program among diverse population of school students to have more improvement in students' dietary knowledge, SE and practices.