CALM Validity and Reliability
Initial Factor Analysis . The CALM measure contains 16-items related to various aspects of care, asking patients to indicate the level of confidence they feel in each aspect (i.e. no confidence, somewhat confident, very confident, extremely confident). These 16 items were entered into a PCA with varimax rotation and yielded four components; analysis yielded 68% of variance in items was explained by these four components (Table 2). The factor loadings were relatively free of multiple loadings and no items warranted deletion.
Table 2. CALM Components