Introduction: Diabetes mellitus is the most common metabolic disease and can lead to serious

complications such as blindness, limb amputation, renal failure, and cardiovascular disease.

Gestational diabetes is diagnosed as impaired glucose tolerance for the first time during pregnancy.

On the other hand, there is a relationship between diabetes and self-efficacy. One of the important

patterns that builds on the ability of individuals and their needs for self-care is our self-care model.

Therefore, the aim of this study was to determine the effect of self-care education program based

on self-care pattern of Orem on self-efficacy in women with gestational diabetes mellitus.

Materials and Method: This was a quasi-experimental study of pre and post type, which was

performed on 42 patients with gestational diabetes mellitus. The data collection tools were

demographic information questionnaire and diabetes self-efficacy scale (CIDS), which were

completed and compared before and after intervention. Data were analyzed by SPSS software

version 22

Results: The mean of self-efficacy score was 52.66 ± 5.27 before the intervention, but after the

intervention, the mean score of this score was 77.21 ± 9.13, which can be said to be samples after

participation in Educational sessions have a high level of self-efficacy. Comparison of mean score

of self-efficacy before and after intervention was statistically significant (P = 0.01).

Conclusion: The results showed that using self-care education using Orem self-care model for

GDM patients increases the average performance of all aspects of self-efficacy in these

individuals. According to this, if self-care program implementation can be continued according to

patient's self-care needs and can be tailored to the level of their perception, they can achieve

positive results in the health of these people and help them to improve their health.