A Comparison of the Pittsburgh Sleep Quality Index, a New Sleep Questionnaire, and Sleep Diaries Page: 18
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than the sleep diary and SQ on SOL, Z= 1.63, p =.10. The relative strengths of the relationships
between the SQ and PSQI with the sleep diary are illustrated by the scatter plots presented in
Figures 1-3. Finally, the correlation between the sleep diary and SQ was significantly greater
than the correlation between the sleep diary and the PSQI global score, Z= 1.99, p < 0.05. The
correlation coefficients between other PSQI Component Scores and the sleep diary are presented
in Table 8.
An additional analysis was performed to determine whether retrospective reports of sleep
are more likely to reflect weekday sleep or weekend sleep. Pearson's product moment
correlations were used to compare estimates of weekday and weekend sleep on the SQ with the
PSQI. The relative magnitude of correlations between weekday estimates of sleep with weekend
estimates of sleep with the PSQI was then assessed quantitatively using the Steiger's Z statistical
test for overlapping variables. The correlation coefficients and Z scores for analyses of total
sleep time, sleep latency, wake after sleep onset, sleep efficiency, and sleep quality are included
in Table 9. For all variables except sleep efficiency, estimates of weekday sleep had significantly
greater correlations with the PSQI than estimates of weekday sleep (ps < .05). This indicates that
retrospective self-report sleep measures that do not differentiate between weekday and weekend
sleep, will be a greater reflection of weekday sleep.18
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Sethi, Kevin J. A Comparison of the Pittsburgh Sleep Quality Index, a New Sleep Questionnaire, and Sleep Diaries, thesis, August 2012; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc177254/m1/26/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .