Background: Adolescence (10-19 years) is one of the most challenging periods in human development. A second period of rapid growth occurs during the teen years. Not much information is available on the effect of the socio-economic status on the outcome of nutrition education in teenage girls. Objective : The purpose of this study was to determine the effect of socio- economic status on the efficacy of nutrition education in promoting the nutritional knowledge, attitude and practice in first-grade guidance school girls in Tehran.

Material & Methods: A total of 300 students were selected from 11 guidance schools by simple sampling and divided into three groups: 1- guide-book, 2- group discussion, 3- control. The knowledge and attitude data were collected using pre-test and post-test questionnaires and the personal-socioeconomic data were collected using general questionnaires. The students in group 1 were given the guide-book and required to study it at home, while group 2 students were told to discuss among themselves the contents of the guide-book. The control group was given nothing to study or to do.

Results: Nutrition education did not have a significant effect on the increase in the attitude score in the students whose grade-point average and their mother’s education level were high. (p= 0.13, p=0.29). Only mother’s education level independently from the type of education was associated with the difference of knowledge score means (p =0.07).There was interaction between nutritional education and monthly pocket- money with regard to the increase in the knowledge score (p =0.03).

Conclusion: Overall, exception of monthly pocket money, the effect of education on the nutritional knowledge and attitude was independent from other variables. Only mother’s education associate with the difference of knowledge score means.