Fig. 4From: The relationship between sleep duration and all-cause mortality in the older people: an updated and dose-response meta-analysisThe dose-response relationship plot for the association of sleep duration with all-cause mortality. Lines with long dashes represent the pointwise 95% confidence intervals for the fitted nonlinear trend (solid line). Lines with short dashes represent the linear trend. The red horizontal line represents the reference line (hazard ratio: 1)Back to article page