Research Paper Volume 13, Issue 11 pp 14816—14828
Association of changes in self-reported sleep duration with mild cognitive impairment in the elderly: a longitudinal study
Figure 1. The adjusted dose-response association between changes in self-reported sleep duration and risk of mild cognitive impairment among the whole population, based on model 4. Changes in self-reported sleep duration was modeled using a restricted cubic spline function with knots at -2, 0, 2 hours. The reference value was set at zero.