An Ultra-Short Measure of Excessive Daytime Sleepiness Is Related to Circadian Biological Rhythms: The French Psychometric Validation of the Barcelona Sleepiness Index.

With regard to convergent validation, the correlations of BSI score with ESS and THAT scores were medium and highly significant ( r = 0.47, p < 10 −4 and r = −0.40, p < 10 −4 , respectively).

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