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. 2023 Oct 19;17:1265016. doi: 10.3389/fnins.2023.1265016

Table 4.

Pearson correlations between objective sleep indices (baseline, follow-up) and memory performance (age and education-adjusted z-scores at follow-up) in the total sample, MCI and CNI groups.

Sleep efficiency WASO 24-h TiB 24-h TST
Memory performance Baseline Follow-up Baseline Follow-up Baseline Follow-up Baseline Follow-up
Total sample 0.287***1 0.196***1 0.217**1 0.177*1
RAVLT: Immediate recall 0.155 0.013 −0.141 −0.207* −0.163* −0.490*** −0.094 −0.447***
RAVLT: Delayed recall 0.176* 0.022 −0.161 −0.197* −0.178* −0.429*** −0.094 −0.377***
RAVLT: Retention index 0.138 0.056 −0.126 −0.258** −0.148 −0.504*** −0.069 −0.435***
PM:Immediate recall 0.241** −0.037 −0.217** −0.138 −0.105 −0.329*** 0.018 −0.300***
PM: Delayed recall 0.254** 0.052 −0.218* −0.202* −0.172* −0.313*** −0.049 −0.258**
PM: Retention index 0.253** 0.114 −0.247** −0.259*** −0.152 −0.389*** −0.017 −0.316***
MCI .1971 .1591 0.322**1 0.236*1
RAVLT: Immediate recall 0.043 −0.082 −0.135 −0.096 −0.202 −0.462*** −0.179 −0.432***
RAVLT: Delayed recall 0.084 −0.149 −0.117 −0.014 −0.113 −0.388** −0.055 −0.350**
RAVLT: Retention index 0.049 −0.104 −0.118 −0.092 −0.152 −0.455*** −0.105 −0.420***
PM:Immediate recall 0.166 −0.079 −0.200 −0.046 −0.033 −0.198 0.092 −0.174
PM: Delayed recall 0.147 −0.017 −0.185 −0.085 −0.108 −0.118 −0.022 −0.075
PM: Retention index 0.161 0.017 −0.209 −0.133 −0.120 −0.299** −0.013 −0.238*
CNI 0.419***1 0.248*1 .1611 .2341
RAVLT: Immediate recall 0.094 0.006 −0.111 −0.131 −0.254* −0.314** −0.297** −0.447***
RAVLT: Delayed recall 0.106 0.077 −0.187 −0.213 −0.359** −0.333** −0.279** −0.377***
RAVLT: Retention index 0.052 0.153 −0.099 −0.309** −0.260* −0.384*** −0.304** −0.435***
PM: Immediate recall 0.188 −0.126 −0.231 −0.030 −0.270* −0.235* −0.249* −0.300***
PM: Delayed recall 0.223 −0.002 −0.265* −0.117 −0.372** −0.220 −0.202 −0.258**
PM: Retention index 0.197 0.125 −0.311** −0.216 −0.335** −0.237* −0.188 −0.316***

TiB, Total Time in Bed; TST, Total Sleep Time; PM, Passage Memory; RAVLT: Rey Auditory Verbal Learning Test. *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001. 1Pearson’s correlation coefficients between baseline and follow-up for each sleep index.