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Averaged age accelerations by sleep index and best‐fitting dose‐response curves. In panels a and b, the blue bars are the mean values of z‐scored age accelerations by the sleep index, error bars are the standard deviations of the age accelerations; in panels c and d, the solid lines are the point estimations, the blue/red dash lines are the 95% confidence limits, the green dash lines are the reference lines, and the dots are the knots at sleep score = 1, 3, and 5
