Referee report. For: Assessment of treatment expectations in women with suspected endometriosis: A psychometric analysis [version 1; peer review: 1 approved with reservations]

This psychometric study used cross-sectional baseline data from 699 German women undergoing laparoscopy for suspected endometriosis to compare and validate four measures of treatment expectations, including the TEX-Q and the GEEE, and to explore expectation clusters. Participants generally reported high expected improvement and low expected worsening of disability, and greater expected worsening was associated with higher expectations of side effects, while correlations among positive and negative expectation dimensions (including side effects) were small to non-significant; cluster analysis of the GEEE items yielded four clusters with 62.2% total explained variance. The authors emphasize that the different expectation instruments did not correlate strongly enough to assume they measure the exact same construct, and that instrument selection must match study aims. This paper is centrally about endometriosis — it psychometrically characterizes treatment expectations in women with suspected endometriosis undergoing laparoscopy and identifies expectation dimensions and clusters.

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