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Volume 14 No. 08
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Scientific Investigations

Sleep Hygiene Index: Psychometric Characteristics and Usefulness as a Screening Tool in a Sample of Nigerian Undergraduate Students

Champion T. Seun-Fadipe, MBChB, MSc, FMCPsych; Olutayo O. Aloba, MBChB, FWACPsych; Olakunle A. Oginni, MBBS, MSc, FWACPsych; Kolawole S. Mosaku, MBBS, MPH, FMCPsych
Mental Health Unit, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Osun State, Nigeria; Department of Mental Health, Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria

Study Objectives:

The objectives of this study were to investigate the psychometric properties of the Sleep Hygiene Index (SHI) and determine its capacity to screen for poor sleep quality in a nonclinical sample of Nigerian university students.

Methods:

A total of 348 students appropriately completed the SHI, the Morningness-Eveningness Questionnaire (MEQ), the Pittsburgh Sleep Quality Index (PSQI), and the Epworth Sleepiness Scale (ESS).

Results:

The internal consistency (Cronbach alpha) of the SHI was .64 and its construct validity was modestly satisfactory. It had a significant negative correlation with the MEQ (r = −.170, P < .001) and positive correlations with global PSQI (r = .289, P < .001) and ESS (r = .219, P < .001) scores. Prior to the factor analysis, our sample was randomly divided into two. In one half of the sample (sample 1), exploratory factor analysis of the SHI items yielded a three-factor model. Confirmatory factor analysis on the other half (sample 2) corroborated this model with satisfactory indices of fitness (c2 = 67.805; df = 55; c2/df = 1.233; P = .115; goodness of fit index = .943; Tucker-Lewis index = .958; incremental fit index = .972; comparative fit index = .970; root mean square error of approximation = .037). A cutoff total score of 16 on the SHI had the best sensitivity (77.0%) and specificity (47.5%) to identify students who were categorized as experiencing poor sleep quality, according to the PSQI (area under the curve = 0.65, 95% confidence interval = 0.59–0.71).

Conclusions:

The SHI exhibited satisfactory psychometric properties as a self-rated assessment instrument in the evaluation of sleep hygiene and as a screening instrument for poor sleep quality among Nigerian undergraduate students.

Citation:

Seun-Fadipe CT, Aloba OO, Oginni OA, Mosaku KS. Sleep hygiene index: psychometric characteristics and usefulness as a screening tool in a sample of nigerian undergraduate students. J Clin Sleep Med. 2018;14(8):1285–1292.




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