Distribution of quality ratings by condition This figure illustrates the distribution of ratings by condition for all the reviews done for that condition. Thus there are multiple observations per patient. The fact that ratings are clustered by reviewer and patient is not accounted for in this figure. The entire scale was used for each condition. A normal density for the observed mean and standard deviation is superimposed on the histogram of the actual distribution of ratings. The conditions are hypertension (HTN), diabetes, chronic obstructive pulmonary disease (COPD), and acute conditions.