Table 4. Correlation between the scores for study questionnaires and components of Polysomnography .

Item	ESS	Berlin’s questionnaire	STOP questionnaire	STOP-BANG questionnaire
Total sleep time	0.039	0.078	0.034	-0.023
Sleep latency	0.059	-0.005	-0.034	0.021
Sleep quality	0.012	0.082	0.094	0.015
REM period time	0.032	-0.032	-0.016	-0.051
REM latency	-0.007	0.096	0.076	0.073
Events (apnea, hypopnea)	0.197 *	0.473 **	0.376 **	0.432 **
Mean oxygen saturation	-0.234 **	-0.274 **	-0.289 **	-0.385 **

* P-value < 0.05

** P-value < 0.001