Objectives:  A study was carried out to determine the reliability, validity and cut-off points of the Spanish version of Ages & Stages Questionnaires: Social-Emotional, 2nd Edition (ASQ:SE-2). Material and Methods: Questionnaire forms of ASQ:SE-2 between 15 to 48 months were applied to parents of children chosen by convenience sampling. Reliability was determined by the internal consistency through Ordinal alpha coefficient (α), and validity of content through Item-test correlation (r). The cut-off points to establish risk zones were determined using the 65th percentile and ROC curve. Results: Two hundred thirty-six questionnaires were applied. The Ordinal alpha coefficient reached a between acceptable to good level (α = 0.73-0.87) for all 5 age-intervals questionnaires between 18 to 48 months. The Item-test correlation index pointed a good discriminatory power for most i...

Objective: A cultural-linguistic adaptation of the Age and Stages Questionnaire third edition (ASQ-3)-Spanish version was performed in order to determine its reliability, validity and cut-off points in an urban population and pediatric outpatient setting of Lima, Perú.  Material and Methods: Questionnaire forms were applied to parents of children between 1 to 66 months old of age, chosen through a convenience sampling method. Results: A total of  5,830 questionnaires were applied to parents of 3,507 children, 2 667 (45.7%) of whom had between 14 and 36 months of age. The general internal consistency and that of five specific areas, measured by means of the Ordinary alpha index oscillated between 0.70-0.94. Content validity by judges’ criteria, using the index by Lawshe method, the Aiken V coefficient, or both, was  valid for most of the questionnaires. The biserial item...