Is endometriosis associated with poor sleep quality? A meta-analysis.

BackgroundEndometriosis is a hormone-driven systemic inflammatory condition characterized by endometrial-like lesions which grow throughout the body affecting up to 15% of women worldwide with symptoms including chronic pain, infertility, and persistent fatigue. Many patients report a reduction in their quality of life, potentially driven in part by poor sleep quality. Despite this low sleep quality is not a commonly recognized symptom of endometriosis.ObjectiveWe aimed to examine the association between endometriosis and poor sleep quality.DesignWe conducted a systematic literature review and mixed-effects meta-analysis to evaluate the association between endometriosis and sleep quality.Data sources and methodsSix studies identified through PubMed and Embase met inclusion criteria and were assessed for quality. Between-group standardized mean differences (SMD) were pooled, and sensitivity analyses and meta-regressions were performed to evaluate the influence of between-study heterogeneity.ResultsPooling of all studies produced a standardized mean difference of 0.69 (95% CI: 0.28,1.09) with high heterogeneity (I2 = 94% p<0.01), which equates to a 2.44 (95%CI: 0.99; 3.85) point increase on the Pittsburg Sleep Quality Index (indicating poorer overall sleep quality) for endometriosis patients compared to healthy controls. This association persisted during sensitivity analyses.ConclusionThis observed association may be driven by a pain-sleep quality feedback loop or by the inflammation and hormonal imbalances of endometriosis. While there are several limitations to interpreting these results, including differences in control selections and adjustments for potential confounders between included studies, it is the first quantitative evaluation of the association between endometriosis and poor sleep quality across populations. Since sleep quality predicts chronic pain patterns, future research and patient treatment plans should focus on potential interventions to improve the sleep quality of endometriosis patients experience to reduce the societal and personal burdens of this disease.