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. 2018 Oct 12;30(10):1271–1277. doi: 10.1589/jpts.30.1271

Table 2. Ethnicity and potential threats to internal validity.

County Number ofparticipants Location of test PT Major factors that may have an impact　on ARAT performance scores
United Kingdom 3 Familiar 2 Staff Attentiveness-instrumentation
Saudi Arabia 7 Familiar Students Fatigue −motivation −drop out
Nigeria 1 Familiar Student Visual acuity −fatigue
India 1 Familiar Student graphic file with name jpts-30-1271-i001.jpg
Brazil 4 2 not familiar 1 Staff Motivation
Greece 4 1 not familiar 1 Student Viewing distance

PT: physiotherapist; ARAT: action research arm test.