... insomnia burden (the sum of items 4, 5, and 6), or total hypersomnia burden (the sum of items 22,23, and 24) entered separately. Gen der and chron icitywere ad ded to the model since they were found ... Patients were evaluated by aresearch psychiatrist weekly during the first 6 weeks,biweekly for the next 4 weeks, and weekly for the finalYang et al. Annals of General Psychiatry 2010, 9:10http://www.annals-general-psychiatry.com/content/9/1/10Page ... role of residual sleep disturbance as a predictor of relapse inMDD.Therefore, the purpose of the present study was toexplore the impact of residual sleep disturbance on the risk of relapse of...