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Table 3 Principal component analysis: factorial solution after varimax rotation

From: Sleep dysregulation, memory impairment, and CSF biomarkers during different levels of neurocognitive functioning in Alzheimer’s disease course

 

Factor loadings

Component 1

Component 2

Component 3

RAVLT-I

0.777

−0.477

 

N1

−0.762

  

MMSE

0.737

−0.320

 

REM

0.734

 

−0.515

N3

0.729

  

RAVLT-D

0.715

−0.475

 

42, pg/ml

0.675

−0.393

 

TST

0.600

  

P-tau pg/ml

 

0.823

 

T-tau pg/ml

−0.393

0.819

 

Age

 

0.548

 

REML

  

0.664

WASO

  

0.641

SL

 

0.328

0.599

  1. Note. 1 The table represents the loads of each variable in each of the three factors extracted by PCA. Loads < 0.30 are not presented. Factor loadings over .40 appear in italics
  2. Abbreviations: MMSE Mini-Mental State Examination, T-tau total tau, P-tau phosphorylated tau, 42 β-amyloid42, RAVLT-I Immediate Recall – Rey Auditory Verbal Learning Test, RAVLT-D Differite Recall – Rey Auditory Verbal Learning Test, TST total sleep time, LREM REM sleep latency, N1 stage 1 of non-REM sleep, N3 stage 3 of non-REM sleep, REM REM sleep, WASO wakefulness after sleep onset, SL sleep onset latency