PT  - JOURNAL ARTICLE
AU  - Zhaoli Dai
AU  - David T.  Felson
TI  - Drs. Dai and Felson reply
AID  - 10.3899/jrheum.201222
DP  - 2020 Oct 15
TA  - The Journal of Rheumatology
PG  - jrheum.201222
4099  - http://www.jrheum.org/content/early/2020/10/13/jrheum.201222.short
4100  - http://www.jrheum.org/content/early/2020/10/13/jrheum.201222.full
AB  - We appreciate the interest and comments by Yang and Hung1 in our recent publication, “Sleep Quality Is Related to Worsening Knee Pain in Those with Widespread Pain: The Multicenter Osteoarthritis Study”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.