Table 2. Spearman’s rho correlation coefficients for the ESS vs. all other scores (n=50).

Parameters	ESS	P value
SSS	r=0.499	<0.001
SPS	r=0.607	<0.001
GVS	r=-0.433	0.002
GAS	r=−0.508	<0.001
HADS-A	r=0.460	0.001
HADS-D	r=0.448	0.001
PAS	r=−0.215	0.135
NAS	r=0.303	0.033

ESS, Epworth Sleepiness Scale; SSS, Stanford Sleepiness Scale; SPS, Samn-Perelli fatigue Scale; GVS, Global Vigor Scale; GAS, Global Affect Scale; HADSA, Hospital Anxiety Score; HADS-D, Hospital Depression Scale; PAS, Positive Affect Scale; NAS, Negative Affect Score.