@article {Daijrheum.201222, author = {Zhaoli Dai and David T. Felson}, title = {Drs. Dai and Felson reply}, elocation-id = {jrheum.201222}, year = {2020}, doi = {10.3899/jrheum.201222}, publisher = {The Journal of Rheumatology}, abstract = {We appreciate the interest and comments by Yang and Hung1 in our recent publication, {\textquotedblleft}Sleep Quality Is Related to Worsening Knee Pain in Those with Widespread Pain: The Multicenter Osteoarthritis Study{\textquotedblright}2. Yang and Hung raised 3 issues about potential biases in the methodology in our study around (1) the assessment methods used for sleep quality, (2) confounding factors such as other pain medication used, and (3) the appropriateness of causality in the study conclusion1.}, issn = {0315-162X}, URL = {https://www.jrheum.org/content/early/2020/10/13/jrheum.201222}, eprint = {https://www.jrheum.org/content/early/2020/10/13/jrheum.201222.full.pdf}, journal = {The Journal of Rheumatology} }