In Kim and his colleagues study, telephone intervention for three months in experiment group reduced glycosylated hemoglobin level about 1.2% and increase adherence to diet regimen significantly in diabetic patients, these results are consistent with present study.[9] Sung and Kim study in south Korea showed combination of educational intervention with telephone counseling and follow-up lead to blood glucose control and improvement of self- management or self- care of diabetic patients.[12] These findings confirm results of our study.
According to Nesari and colleagues research in Iran in 1386 (2007) year, with aim of examining the effect of tele-nursing on diabetic patients adherence to diet regimen, after diet counseling and self- care educations with 12 week calls follow-up, results showed reduction of Hb A1c level and increase of adherence to diet significantly in intervention group.[13]