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Forest plots for the meta‐analyses regarding the association between insomnia and frailty in the older population: (a) overall meta‐analysis and (b) subgroup analysis according to the symptoms of insomnia. Abbreviations: CI, confidence interval; DFA, difficulty in falling asleep; DMS, difficulty in maintaining sleep; EMA, early morning awakening; NRS, non‐restorative sleep; OR, odds ratio
