LAUSR

BACKGROUND Practitioners often assess the motor skills of children presented with suspected developmental delays. It is essential that the tests used to assess children have strong measurement properties including validity. AIM The structural validity of the Bruininks-Oseretsky Test of Motor Proficiency - second edition Brief Form (BOT-2-BF) was investigated. METHOD 123 healthy children (67 males & 56 females; M = 10 years, 2 months; SD = 1 year, 4 months) completed the BOT-2-BF. The Rasch Measurement Model (RMM) was used to assess the 14-item BOT-2-BF's dimensionality, hierarchical ordering, differential item functioning (DIF), and item and person separation reliability. RESULTS Nine BOT-2-BF misfit RMM requirements. A second RMM analysis of a five-item BOT-2-BF version was completed. The five-item version did meet the RMM requirements of item fit, dimensionality, hierarchical ordering, lack of DIF, and adequate item and person separation reliability. IMPLICATIONS The 14-item version of the BOT-2-BF is not recommended for use as a screening scale to assess children's motor skill performance. However, a revised five-item version of the BOT-2-BF did appear to meet RMM expectations. Further psychometric assessment of the revised five-item version of the BOT-2-BF is recommended.