Question 2: how does the concurrent validity of BriefPCS scores compare to that of PCS scores?
depression, anxiety, pain
To compare the concurrent validity of BriefPCS and PCS scores, we calculated Bootstrapped Pearson correlations between PCS scores and scores on PROMIS measures of pain intensity, pain interference, physical function (upper extremity movement, mobility), depression, and anxiety. We repeated these analyses using BriefPCS scores. Results were evaluated based on whether 95% CIs of coefficient estimates overlapped, which would indicate that coefficient estimate differences were not statistically significant (alpha ≤ 0.05)