. Author manuscript; available in PMC: 2011 Dec 1.

Published in final edited form as: J Pain. 2010 May 10;11(12):1338–1347. doi: 10.1016/j.jpain.2010.03.009

Table 4.

Sex, changes in daily events, and their interaction in the prediction of next-day fatigue.

Predictor Variables	β	T	Probability
Female	2.67	1.52	.13
Co-morbid Pain Condition	8.35	5.15	< .0001
Same-day Fatigue	0.27	18.57	<.0001
Δ Pain	0.07	3.32	.001
Δ Positive Events	0.10	0.58	.56
Δ Negative Events	0.55	3.26	.002
Δ Positive Events × Female	0.41	2.05	.04

Note: Pain and event scores are person-centered. Pain score was modeled as a random effect. Next-day fatigue was significantly higher in individuals with a co-morbid pain condition relative to those without one, and on days following a high fatigue level. Next-day fatigue was also higher for individuals following days when they experienced more than their average level of pain and greater than their average number of negative events. For women only, next-day fatigue was higher following days with greater than their average number of positive events.