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Funnel plots of x axis: standardised mean difference, y axis: standard error, for studies included in meta-analysis to visually assess publication bias. Panel (A) Systolic blood pressure. Panel (B) Diastolic blood pressure. Panel (C) Body mass index. Panel (D) Objective sleep duration. Panel (E) Objective sleep efficiency. Panel (F) Subjective sleep duration. Panel (G) Subjective sleep quality. Panel (H) Perceived health status.
