Development of a scale to assess the diurnal impact of insomnia

Abstract

a b s t r a c t a r t i c l e i n f oThe objective of this study was to develop and validate a scale to assess the diurnal impact of insomnia. The Insomnia Diurnal Impact Scale (IDIS) comprises six items designed to evaluate the daytime effects of insomnia. The psychometric properties of the original scale were analysed in a sample of 172 students, while its ability to differentiate insomniacs and non-insomniacs (according to the International Classification of Diseases (ICD)-10 criteria) was examined in a sample of 79 psychiatric patients and 82 individuals from the community. The psychometric properties of the English version were then analysed in a sample of 44 Englishspeaking participants. The results showed the internal consistency coefficient to be very good (0.86), with test-retest reliability at 1 month being 0.79. A single factor explained almost 60% of the variance. Correlation of the IDIS with other scales varied between moderate and high values. Sensitivity was 78% and specificity 57% in the community sample, while the corresponding figures for the psychiatric population were 83% and 63%. Cronbach's α coefficient for the English version reached a value of 0.93. These results indicate that the IDIS shows adequate reliability and validity with both general and psychiatric populations, and also that it can discriminate between the presence and absence of insomnia. The English version presents good preliminary results regarding item-corrected total correlation and internal consistency. In conclusion, the IDIS appears to be a useful tool in the primary care and mental health contexts for assessing insomnia-related diurnal dysfunction.

Sleep-related functional impairment as a moderator of risky drinking and subsequent negative drinking consequences in college students

“…On average, participants reported moderate levels of sleep-related functional impairment (M = 7.82; SD = 3.37), sub-threshold insomnia (M = 8.57; SD = 5.37), eight hours (SD = 1.17) of sleep per night, and an evening (versus morning) circadian preference (M = 46.90; SD = 7.59) at T1. These mean levels of sleep-related variables are comparable to those in a prior college study (Ruiz, Guilera, & Gomez-Benito, 2011). Among this sample, 21 students (13%) screened positive for clinical insomnia at T1 according to the Insomnia Severity Index standard threshold (Bastien, Vallieres, & Morin, 2001;Buysse et al, 2006).…”

“…2.2.1 Sleep-related functional impairment-The 6-item Insomnia Diurnal Impact Scale (Ruiz, Guilera, & Gomez-Benito, 2011) assessed the negative daytime effects of nighttime sleep difficulty over the "past month or longer" at T1 and T2. Participants indicated the degree to which they agreed with statements regarding daytime dysfunction (e.g., "I have generally felt sleepy throughout the day," "I have found it difficult to concentrate during the day") using a 4-point Likert scale ranging from 0 (totally disagree) to 3 (totally agree).…”

“…Sleep-related functional impairment is a sub-component of "sleep quality," which is a complex construct encompassing both quantitative (e.g., total sleep time) and subjective (e.g., daytime impairment) aspects of sleep (Buysse et al, 1989). Sleeprelated functional impairment represents the diverse daytime consequences of poor sleep, including sleepiness, irritability, and difficulties with concentration and socializing (Ruiz, Guilera, & Gomez-Benito, 2011). Sleep-related functional impairment may reduce one's capacity to make safe decisions and avoid impulsive behaviors, such as risky drinking (Kenney et al, 2012).…”

“…However, sleep-related functional impairment overlaps considerably with other sleep constructs and sleep-related correlates. Specifically, sleep-related functional impairment has demonstrated moderate to high correlations with nighttime sleep difficulty (i.e., Athens Insomnia Scale, r = .65; Ruiz, Guilera, & Gomez-Benito, 2011). Thus, existing research on the moderating influences of poor sleep quality and insufficient sleep time on the college drinking and subsequent negative drinking consequences relationship (Kenney et al, 2012;Miller et al, 2016) may be due, at least in part, to sleep-related functional impairment.…”

Reliability, factor analysis and internal consistency calculation of the Insomnia Severity Index (ISI) in French and in English among Lebanese adolescents

“…The Insomnia Severity Index (ISI) is a self-reporting scale that includes two of the most common complaints about insomnia: difficulty initiating sleep and frequent awakenings from sleep [16] , [17] . This scale has been widely used for clinical purposes and research, since its introduction in 1993 [18] .…”