Reliability of selected psychomotor measures with mentally retarded adult males

Reliability estimates were determined for 24 moderately mentally retarded adult males on three psychomotor tasks. For four consecutive days measures were taken on reaction time, auditory and visual, 15 trials daily for each; grip strength, dominant and non-dominant hand, two trials daily for each; and standing long jump, three trials daily. Analyses of variance, adjusted for day-to-day trend, were applied to the data. Intraclass reliability coefficients for both dominant (R = .96) and non-dominant (R = .94) hand-grip strength were high. The reaction time scores for both the auditory (R = .87) and visual (R = .83) data were moderately reliable. A low reliability coefficient (R = .49) was obtained for the standing long jump.