Figure 4.

Results of path models illustrating the mediated effect of baseline 24-h TST on follow-up word list (RAVLT) and Passage memory performance through 24-h TST. Direct (solid arrows) and indirect effects (dotted arrows) are expressed as standardized regression coefficients (p values in parentheses). All models take into account the covariance between baseline sleep and memory variables, the direct and indirect paths from baseline memory to follow-up memory scores (see also Supplementary Table S1), and the following covariates (not shown): age, gender, education years, depression or anxiety diagnosis, insomnia symptoms, BMI, sleep apnea, benzodiazepine use and medical morbidities. Model fit indices are also shown.BS, Baseline; FU, Follow-up; df, degrees of freedom; GFI, Goodness of fit index; RMSEA, Root Mean Square Error of Approximation; TST, Total Sleep Time; RAVLT, Rey Auditory Verbal Learning Test.