Table 2.

For chronic fatigue syndrome (CFS) subjects, r- and p-values for regressions (all positive) of seated pulse pressure (PP) against absolute volumes of grey matter (GMV), white matter (WMV) and GMV + WMV for regions of interest (ROIs) of the whole brain and major divisions

	GMV		WMV		GMV + WMV
	r	p	r	p	r	p
Whole brain	0.44	0.04	0.49	0.02	0.49	0.02
Brainstem	0.64	0.001	0.39	NS	0.53	0.01
Cerebellum	0.33	NS	0.49	0.02	0.41	NS
Frontal lobe	0.37	NS	0.44	0.04	0.43	0.05
Temporal lobe	0.40	NS	0.42	NS	0.43	0.05
Parietal lobe	0.52	0.01	0.58	0.005	0.57	0.006
Occipital lobe	0.54	0.01	0.52	0.01	0.54	0.009

All regressions were adjusted for age and hospital anxiety and depression scale (HADS) anxiety and depression. There were no significant regressions for normal controls (NC). Only the brainstem GMV regression was significantly different in CFS and NC.

NS, not significant.