Validation of the Revised Knox Preschool Play Scale for the Brazilian Population.

Background: Play is essential to child development, and its evaluation is considered valid to indicate the stage of development of the child and indicate possible lagging. The Revised Knox Preschool Play Scale (RKPPS) provides an evolving description of the typical play behavior of preschool children, in six-month periods from zero to three years of age and then in annual periods up to six years of age. The RKPPS has already undergone the process of cultural adaptation for use in the Brazilian population, and it is necessary to analyze its applicability.

Aims: To verify the reliability and internal consistency of the RKPPS for Brazilian children.

Method: 135 children participated in the study, divided into different age groups with 15 in each group, and were filmed during free play in school or home contexts. Two independent raters evaluated the footage from two different times. Based on these evaluations, a statistical analysis was carried out in order to ascertain the reliability and the internal consistency of the Brazilian version of the RKPPS.

Results: Intra- and interrater reliability showed a predominance of near-perfect to moderate agreement; however, some dimensions of certain age groups presented reasonable to poor agreement. The internal consistency was found to be satisfactory for most of the items evaluated; however, there were items with poor results in some dimensions of certain age groups.

Conclusions: There is a need for further analysis of these items by a committee of experts to ensure the reproducibility of the instrument.