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 2. The adjusted dose-response association between changes in self-reported sleep duration and risk of mild cognitive impairment among the subgroup population, stratified by gender, age, sleep time and sleep quality at baseline, 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.