Psychometric properties of an @entity22 -specific measure of worry: the XXXX and Preoccupation about Sleep Questionnaire.

@entity1 @entity308 @entity73 @entity148 @entity25 @entity22
The aim of this study was to examine the psychometric properties of the @entity148 and Preoccupation about Sleep Questionnaire (APSQ), with a focus on factorial validity and internal consistency as well as discriminative, convergent, and association with @entity25 and @entity73 . Among a randomly selected sample from the general population (N = 5,000), 2,333 @entity1 completed a survey on nighttime symptoms, daytime symptoms, health outcomes, and psychological processes. The study sample consisted of 1800 @entity1 who did not fulfill criteria for another @entity25 than @entity22 . A two-factor solution, accounting for 70.7% of the variance, was extracted from the 10 APSQ items. One six-item factor determined worries about the consequences of poor sleep (a = .91); the second factor, with four items, assessed worries about the uncontrollability of sleep (a = .86). The two factors were significantly intercorrelated (   = .65) and significantly associated with the total APSQ (  s = .97 and .76, respectively). The APSQ and the two subscales showed discriminant validity between three sleep status groups (normal sleep, poor sleep, and @entity22 ; R(2) = .33-.41). The APSQ and the subscales demonstrated convergent validity with measures on cognitive arousal, sleep-related beliefs, @entity148 , and @entity308 . They also were significantly correlated with @entity25 and @entity73 . The findings suggest that the APSQ is a psychometrically sound instrument for assessing worry in @entity22 .
