Skip to main content
. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: J Psychosom Res. 2010 Sep 1;69(5):467–473. doi: 10.1016/j.jpsychores.2010.07.004

Table 2.

Rotated factor loadings (Pattern Matrix) for VAS, ESS, SSS, PVT measures, and POMS subscales

Factor
Variable F 1 F 2 F 3
VAS .90 .03 .11
ESS .88 −.04 −.04
SSS .84 .12 −.12
Median RT .03 .98 .01
Lapse Frequency .07 .97 −.05
POMS ‘Vigor’ .09 −.17 .94
POMS ‘Fatigue’ .24 −.29 −.70
Eigenvalue 2.90 1.97 1.00
Cumulative variance 41.41 69.54 83.84

Note. Items in bold indicate significant loading of the variable on the factor. F 1 = Factor 1: subjective report of sleepiness/fatigue; F 2 = Factor 2: psychomotor performance; F 3 = Factor 3: POMS: Vigor/Fatigue. ESS: Epworth Sleepiness Scale; SSS: Stanford Sleepiness Scale; VAS: Visual Analogue of Fatigue Scale; RT: Reaction Time; POMS: Profile of Mood States.