. Author manuscript; available in PMC: 2008 Dec 5.

Published in final edited form as: Physiol Behav. 2007 Jul 25;92(5):963–968. doi: 10.1016/j.physbeh.2007.07.001

Table 5.

Multilevel model estimates for sleep quality^*

(Total record number = 305)	Mean (S.E.) effect	p value
Intercept (γ₀₀)	75.3 (5.9)	< 0.001
GROUP(γ₀₁)^†	-32.1 (8.3.)	0.001

S.E., standard error; CFS, chronic fatigue syndrome group; CON, healthy control group.

Based on the model: sleep quality score = γ₀₀ + γ₀₁GROUP + residuals.

^†

Coefficients for the chronic fatigue syndrome group.