Validity and reliability determination of Denver developmental screening test-II in 0-6 year-olds in Tehran

ABSTRACT

This research was designed to identify the validity and reliability of the Persian version of Denver Developmental Screening Test II [DDST-II] in Iranian children, in order to provide an appropriate developmental screening tool for Iranian child health workers. At first a precise translation of test was done by three specialists in English literature and then it was revised by three pediatricians familiar with developmental domains. Then, DDST-II was performed on 221 children ranging from 0 to 6 years, in four Child Health Clinics, in north, south, east and west regions of Tehran city. In order to determine the agreement coefficient, these children were also evaluated by Ages and Stages Questionnaires [ASQ] test. Because ASQ is designed to use for 4-60 month- old children, children who were out of this rang were evaluated by developmental pediatricians. Available sampling was used. Obtained data was analyzed by SPSS software. Developmental disorders were observed in 34% of children who were examined by DDST-II, and in 12% of children who were examined by ASQ test. The estimated consistency coefficient between DDST-II and ASQ was 0.21, which is weak, and between DDST-II and the physicians' examination was 0.44. The content validity of DDST-II was verified by reviewing books and journals, and by specialists' opinions. All of the questions in DDST-II had appropriate content validity, and there was no need to change them. Test-retest and Inter-rater methods were used in order to determine reliability of the test, by Cronbach's alpha and Kauder-Richardson coefficients. Kauder-Richardson coefficient for different developmental domains was between 61% and 74%, which is good. Cronbach's alpha coefficient and Kappa measure of agreement for test-retest were 92% and 87% and for Inter-rater 90% and 76%, respectively. Persian version of DDST-II has a good validity and reliability, and can be used as a screening tool for developmental screening of children in Tehran city