Table 4.

Bootstrapped estimates and confidence intervals for tests of simple mediation

Independent variable	Mediator variable	Path c (IV to DV) Total effect B (SE)	Effect of IV on M (a) B (SE)	Effect of M on DV (b) B (SE)	Direct effects (c’) B (SE)	Indirect effect (a x b) B (SE) [95% CI]
Group	Mental activity (CIS –Concentration)	−15.8 (3.5)***	−5.8 (2.7)*	.8 (.18)***	−11.2 (3.0)***	−4.6 (2.6) [−10.6 to −0.2]
	Physical activity (IPAQ total METS)	−15.8 (3.5)***	2611.3 (1205.0)*	−.0006 (.0005)	−14.2 (3.8)***	−1.6 (1.2) [−4.2 to 0.4]
	Social activity (SIP-SI)	−15.8 (3.5)***	−415.6 (76.0) ***	.02 (.01)**	−7.5 (4.4)	−8.3 (4.2) [−17.7 to −1.2]
	Self-efficacy (SES)	−15.8 (3.5)***	2.3 (1.0)*	−1.4 (.56)*	−12.5 (3.5)**	−3.3 (1.7) [−6.8 to −0.2]
	Fatigue catastrophizing (FCS)^	−15.8 (3.5)***	−4.8 (2.0) *	.57 (.33)	−14.2 (4.1)**	−2.7 (3.0) [−10.3 to 0.1]
	Helplessness (ICQ)	−15.8 (3.5)***	−3.9 (1.2)**	1.7 (.4)***	−9.1 (3.3)**	−6.7 (2.2) [−11.1 to −2.2]
	Focusing on symptoms (IMQ)	−15.8 (3.5)***	−7.8 (2.3)**	.51 (.25)*	−11.8 (3.9)**	−4.0 (1.7) [−7.1 to −0.1]

Unstandardized regression coefficients reported. IV, independent variable (treatment group); DV, dependent variable (fatigue at Time 2); M, mediator variable (perpetuating factor measure at Time 2); CI, confidence interval.

^ FCS at Time 1 entered as covariate.

*p ≤ .05, **p ≤ .01, ***p ≤ .001.