Question special

You mentioned that one of the weaknesses of the study was that CPC scores were determined via phone interviews with a single psychologist. My question is how do you think the results might have been affected if CPC scores were determined in person or were determined by several evaluators? Also, as far inter-rater reliability of CPC scores, how do you think CPC scoring can be be compared between several studies that have used CPC scoring as an objective modality. Were any alternatives to CPC scores discussed such as Health Utilities Index?