This form consists ofsymptom constructs, each to be rated on a Brief Psychiatric. (BPRS) Introduction. Degree of concern over present bodily healthRating psychiatric impairment using the PIRS is a two-step procedureDetermining the Median Class ScoreCalculation of the Aggregate Score Determining The Median Class Score: Each area of function described in the PIRS is given an impairment rating which ranges from ClasstoThe six scores are arranged in For more accurate mental and behavioral health imp