TY - JOUR
T1 - Importance of testing the internal consistency and construct validity of the Pittsburgh Sleep Quality Index (PSQI) in study groups of day and night shift workers
T2 - Example of a sample of long-haul truck drivers in South Africa
AU - Roche, Johanna
AU - Vos, Alinda G
AU - Lalla-Edward, Samanta T
AU - Kamerman, Peter R
AU - Venter, Wd Francois
AU - Scheuermaier, Karine
N1 - Funding Information:
This work was funded by North Star Alliance through a research and implementation grant received from the Ministry of Foreign Affairs of the Netherlands , managed by the Royal Dutch Embassy of Mozambique. The Amsterdam Institute for Global Health and Development and Wits RHI held separate contracts with North Star Alliance (AIGHD's grant reference: 0068 North Star – NSCDP; RHI's grant number: D1404070 ). JR received a research grant from the University Research Council (URC) of the University of the Witwatersrand, Johannesburg, South Africa.
Funding Information:
This work was funded by North Star Alliance through a research and implementation grant received from the Ministry of Foreign Affairs of the Netherlands, managed by the Royal Dutch Embassy of Mozambique. The Amsterdam Institute for Global Health and Development and Wits RHI held separate contracts with North Star Alliance (AIGHD's grant reference: 0068 North Star ? NSCDP; RHI's grant number: D1404070). JR received a research grant from the University Research Council (URC) of the University of the Witwatersrand, Johannesburg, South Africa.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/1
Y1 - 2022/1
N2 - Irregular work times promote inconsistent completion of the Pittsburgh Sleep Quality Index (PSQI) among shift workers. We aimed to demonstrate the importance of testing the internal consistency and construct validity of the PSQI and of the Epworth Sleepiness Scale (ESS) by presenting the methodology in a sample of long-haul truckers in South Africa. Internal consistency of the questionnaires was assessed by Cronbach's alpha (defined as raw alpha≥0.70), and construct validity by factor analysis. 302 participants (49.3%) reported at least one night shift/week. Overall, the PSQI and ESS's alpha were 0.42 and 0.85, respectively. The factors explained 19.6% of 57.0% of the variance. The PSQI's alpha was 0.46 in night shift workers and 0.38 in non-night shift workers. In this occupational group, the PSQI must be used with caution. Testing the internal consistency and construct validity among the assessed population seems necessary. Sleep questionnaires adapted to shift workers should be preferred.
AB - Irregular work times promote inconsistent completion of the Pittsburgh Sleep Quality Index (PSQI) among shift workers. We aimed to demonstrate the importance of testing the internal consistency and construct validity of the PSQI and of the Epworth Sleepiness Scale (ESS) by presenting the methodology in a sample of long-haul truckers in South Africa. Internal consistency of the questionnaires was assessed by Cronbach's alpha (defined as raw alpha≥0.70), and construct validity by factor analysis. 302 participants (49.3%) reported at least one night shift/week. Overall, the PSQI and ESS's alpha were 0.42 and 0.85, respectively. The factors explained 19.6% of 57.0% of the variance. The PSQI's alpha was 0.46 in night shift workers and 0.38 in non-night shift workers. In this occupational group, the PSQI must be used with caution. Testing the internal consistency and construct validity among the assessed population seems necessary. Sleep questionnaires adapted to shift workers should be preferred.
KW - Sleep quality
KW - Southern Africa
KW - Truckers
UR - http://www.scopus.com/inward/record.url?scp=85112505679&partnerID=8YFLogxK
U2 - 10.1016/j.apergo.2021.103557
DO - 10.1016/j.apergo.2021.103557
M3 - Article
C2 - 34411851
SN - 0003-6870
VL - 98
SP - 1
EP - 5
JO - Applied ergonomics
JF - Applied ergonomics
M1 - 103557
ER -