Table 5.

Multilevel models predicting daily fatigue from mean and within-person variability in symptoms

	Unadjusted Analysis						Adjusted Analysis
	β	SE	df	t	p		β	SE	df	t	p
Fixed Effects
Level 2 (Between-Subjects)
Mn Pain Intensity	.73	.05	254	14.13	<.001		.41	.14	256	2.86	<.01
Mn Pain Unpleasantness	.70	.05	254	14.33	<.001		.16	.14	257	1.12	.26
Mn Depressed Mood	.49	.05	255	10.76	<.001		.08	.07	264	1.26	.21
Mn Anxiety	.50	.05	256	10.92	<.001		.23	.06	263	3.62	<.001
Level 1 (Within-Subjects)
Time	−.16	.06	126	−2.53	.01		−.05	.04	52	−1.37	.18
C_Pain Intensity	.48	.02	198	19.12	<.001		.13	.03	479	4.05	<.001
C_Pain Unpleasantness	.47	.02	185	19.44	<.001		.28	.03	374	9.47	<.001
C_Depressed Mood	.40	.03	177	12.48	<.001		.16	.03	197	5.20	<.001
C_Anxiety	.33	.03	174	10.48	<.001		.12	.03	176	4.85	<.001
Time × C_Pain Intensity	.00	.00	2291	1.15	.25		.00	.00	1212	.77	.44
Time × C_Pain Unpleasantness	.00	.00	2540	.79	.43		.00	.00	1043	1.18	.24
Time × C_Depressed Mood	−.00	.00	2853	−1.57	.12		−.00	.00	1346	−1.21	.23
Time × C_Anxiety	−.00	.00	1870	−.44	.66		.00	.00	1045	.19	.85
		β	SE	Z	p			β	SE	Z	p
Random Effects
Residual								132.36	3.26	40.60	<.001
Intercept Variance								454.82	41.65	10.92	<.001
Slope Variance								.09	.04	2.49	.01
C_Pain Intensity		.07	.01	5.33	<.001			.03	.01	2.62	<.01
C_Pain Unpleasantness		.07	.01	5.58	<.001			.03	.01	2.91	<.01
C_Depressed Mood		.13	.02	5.91	<.001			.07	.02	4.84	<.001
C_Anxiety		.12	.02	5.89	<.001			.05	.01	4.63	<.001

Note: Mn=Mean; C=Centered.