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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: J Psychosom Res. 2010 Jul 1;69(5):475–483. doi: 10.1016/j.jpsychores.2010.05.005

Table 3.

Semi-partial correlations between indicators of fatigue or quality of life and each of the three factors identified with the exploratory factor analysis

Indicator F1a F2 F3 h2
MFI general fatigue .66 .02 .01 .81
MFI physical fatigue .49 .32 −.16 .72
MFI mental fatigue .35 −.01 .15 .33
MFI reduced activities .41 .15 .00 .45
MFI reduced motivation .37 −.17 .28 .42
SF-36 physical functioning −.07 .66 .01 .54
SF-36 role physical .17 .31 .26 .48
SF-36 bodily pain −.05 .50 .07 .34
SF-36 general health .13 .52 −.01 .54
SF-36 vitality .62 −.03 .09 .75
SF-36 social functioning .26 .09 .37 .53
SF-36 role emotional .02 .07 .61 .52
SF-36 mental health .08 .00 .56 .49
ISI interference .39 −.03 .19 .41
    Percent of variance b 12.57 8.64  7.64
a

Factor labels: F1 = fatigue; F2 = physical health; F3 = mental health.

b

Because of the use of the oblique rotation method, an additional 23.36% of explained variance is unaccounted for in the reported percentages of variance and can be attributed to shared variance between factors.

Note. Variables in each factor are those displayed in larger bold font under the factor’s column. Prior to the analysis, SF-36 subscales were reversed, higher scores indicative of greater impairment, as it is the case for the MFI subscales and the ISI item.