Factor analysis of neuropsychological tests

KB Katharina Brosch
FS Frederike Stein
SS Simon Schmitt
JP Julia-Katharina Pfarr
KR Kai G. Ringwald
FT Florian Thomas-Odenthal
TM Tina Meller
OS Olaf Steinsträter
LW Lena Waltemate
HL Hannah Lemke
SM Susanne Meinert
AW Alexandra Winter
FB Fabian Breuer
KT Katharina Thiel
DG Dominik Grotegerd
TH Tim Hahn
AJ Andreas Jansen
UD Udo Dannlowski
AK Axel Krug
IN Igor Nenadić
TK Tilo Kircher
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Using SPSS 27, (Statistical Package for Social Science, IBM) an explorative principal axis factor analysis with varimax rotation was performed to identify aggregated domains of cognitive functioning (see Supplement). As neuropsychological test variables were differentially scaled, z-transformed values were used for the factor analysis. Suitability of neuropsychological test data for factor analysis was tested using Bartlett’s test of sphericity [55] and the Kaiser–Meyer–Olkin test (KMO) [56]. Factors were extracted according to the Kaiser’s eigenvalue greater than one criterion [57]. Factor loadings were extracted using the regression method as implemented in SPSS.

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