correlation of single assessment numeric evaluation (sane) with other patient reported outcome measures (proms)

Background: the single assessment numeric evaluation (sane) is a simple, one-question patient-reported outcome measure (prom). we systematically reviewed correlations between sane and more extensive proms. methods: we identified studies with correlation coefficients between sane and other shoulder, knee, and ankle specific proms. we calculated mean, median and range across studies and time points of data collection. results: eleven studies provided 14 correlations, six shoulder-specific proms in four studies, six knee-specific proms in six studies and two ankle specific proms in one study. the mean correlation comparing sane and knee-specific proms was 0.60 (sd 0.24), median 0.66, and range 0.12 to 0.88. among studies comparing sane and shoulder specific proms mean correlation was 0.59 (sd 0.20), median 0.62 and range 0.20 to 0.89. the mean correlation between sane and ankle-specific proms was 0.69 (sd 0.17), median 0.69 and range 0.75 to 0.81. conclusion: there seems to be moderate correlation amongst proms, even those that are a single question. future research might address whether patient reported outcome measure a common underlying construct even when they consist of a single question. level of evidence: v