Evaluating the Validity and Reliability of PDQ-II and Comparison with DDST-II for Two Step Developmental Screening|
Shahshahani, Soheila; Sajedi, Firoozeh; Azari, Nadia; Vameghi, Roshanak; Kazemnejad, Anooshirvan & Tonekaboni, Seyed-Hasan
Objective: This research was designed to identify the validity and reliability of the Prescreening
Developmental Questionnaire 2 (PDQ-II) in Tehran in comparison with the Denver Developmental
Screening Test-II (DDST-II).
Methods: After translation and back translation, the final Persian version of test was verified by
three pediatricians and also by reviewing relevant literature for content validity. The test was
performed on 237 children ranging from 0 to 6 years old, recruited by convenient sampling, from
four health care clinics in Tehran city. They were also evaluated by DDST II simultaneously.
Interrater methods and Cronbach's a were used to determine reliability of the test. The Kappa
agreement coefficient between PDQ and DDST II was determined. The data was analyzed by SPSS
Findings: All of the questions in PDQ had satisfactory content validity. The total Cronbach's α
coefficient of 0-9 months, 9-24 months, 2-4 years and 4-6 years questionnaires were 0.951, 0.926,
0.950 and 0.876, respectively. The Kappa measure of agreement for interrater tests was 0.89. The
estimated agreement coefficient between PDQ and DDST II was 0.383. Based on two different
categorizing possibilities for questionable scores, that is, "Delayed" or "Normal", sensitivity and
specificity of PDQ was determined to be 35.7-63% and 75.8-92.2%, respectively.
Conclusion: PDQ has a good content validity and reliability and moderate sensitivity and
specificity in comparison with the DDST-II, but by considering their relatively weak agreement
coefficient, using it along with DDST-II for a two-stage developmental screening process, remains
Development; Developmental Delay; Screening; Questionnaire; Validity and Reliability