Abstract
OBJECTIVE: To evaluate the validity of the Oura Ring (OR; Oura Health Ltd.) in measuring sleep parameters compared to medical-grade sleep studies including polysomnography (PSG) or actigraphy (ACT). DATA SOURCES: PubMed, Scopus, and CINAHL. REVIEW METHODS: A systematic review and meta-analysis was conducted in accordance with PRISMA guidelines. Studies were included if they evaluated sleep parameters measured simultaneously by the OR and PSG or ACT. Outcomes assessed included Total Sleep Time (TST), Sleep Efficiency (SE), Wake After Sleep Onset (WASO), Sleep Onset Latency (SOL), Light Sleep Time (LST), Deep Sleep Time (DST), and Rapid Eye Movement (REM) sleep time. Mean differences with 95% confidence intervals were calculated using a random-effects model. A P < .05 was considered statistically significant. RESULTS: Out of 2104 articles, 6 studies (n = 388) were included. There were no statistically significant differences between the OR and PSG/ACT for TST (MD: -2.97 min; 95% confidence interval [CI]: -10.27 to 4.33), SE (MD: -1.32%; 95% CI: -2.76 to 0.12), WASO (MD: 1.64 min; 95% CI: -12.57 to 15.86), SOL (MD: 0.48 min; 95% CI: -2.93 to 3.89), LST (MD: -4.27 min; 95% CI: -24.68 to 16.13), DST (MD: 1.39 min; 95% CI: -10.45 to 13.23), and REM sleep time (MD: -3.89 min; 95% CI: -17.23 to 9.46). CONCLUSION: The OR demonstrates comparable accuracy to PSG and ACT for commonly measured sleep parameters, supporting its utility as a self-monitoring tool. This could prompt earlier clinical evaluation in symptomatic individuals or support remote monitoring of sleep.