All of the questions in DDST II had content validity, and there was no need to change them. The estimated consistency coefficient between DDST II and ASQ was weak (0.21), and between DDST II and physician’s examination was 0.44. Results: There were developmental disorders in 34% and 12% of children who were examined by DDST II, and ASQ test respectively. Obtained data was analyzed by SPSS software. In order to determine agreement coefficient, these children were also evaluated by ASQ test in 4-60 months old children, and by developmental pediatricians in children who were out of this range. Then, DDST II was performed on 221 children aged 0 to 6 years, in four child health care centers of Tehran city. Methods: A precise translation of the original test to Persian was done and it was revised by three developmental pediatricians. Objective(s): To identify the validity and reliability of Denver Developmental Screening Test II (DDST II) in Iranian children, in order to provide an appropriate developmental screening tool for evaluation of Iranian children development.
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