Knowledge Tree
Relations (1)
cross_type 4.86 — strongly supporting 28 facts
London is a primary location used in comparative studies of university students to measure sleep quality via the Pittsburgh Sleep Quality Index (PSQI), as evidenced by the comparative data in [1], [2], and [3]. These studies analyze how PSQI scores correlate with various cognitive performance metrics specifically within the London student population [4], [5], and [6].
Facts (28)
Sources
Investigating the impact of sleep quality on cognitive functions ... frontiersin.org 28 facts
referenceThe study 'Investigating the impact of sleep quality on cognitive functions' utilized a moderation analysis to test whether the relationship between sleep quality (PSQI scores) and cognitive performance (measured by RAVLT, Stroop Test, RPM, and WCST) differs significantly between university students in Tokyo and London.
measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Raven's Progressive Matrices (RPM) performance does not differ significantly between students in Tokyo and London (β = −0.05, p = 0.32).
measurementUniversity students in Tokyo reported significantly poorer sleep quality (Mean PSQI = 9.2, SD = 3.0) compared to university students in London (Mean PSQI = 7.8, SD = 3.3) with a p-value < 0.001 and Cohen's d = 0.44.
claimThe magnitude of negative correlations between sleep quality and cognitive performance is consistently larger in Tokyo than in London for all cognitive measures, suggesting the impact of sleep quality on cognitive performance may be more pronounced among university students in Tokyo.
claimIn the moderation analysis conducted by the study 'Investigating the impact of sleep quality on cognitive functions', the variable β (PSQI) represents the direct effect of sleep quality on cognitive performance controlling for city, β (City) represents the direct effect of city on cognitive performance controlling for sleep quality, and β (PSQI x City) represents the interaction term indicating whether the relationship between sleep quality and cognitive performance differs between Tokyo and London.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Raven's Progressive Matrices (RPM) performance is −0.30 in Tokyo and −0.15 in London.
measurementA moderation analysis comparing Tokyo and London showed that the relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Rey Auditory Verbal Learning Test (RAVLT) performance was significantly stronger in Tokyo (β = -0.35, p < 0.001) than in London (β = -0.15, p < 0.05).
measurementIn London, the correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Raven's Progressive Matrices (RPM) performance is marginally significant at p = 0.04, while other cognitive correlations are significant at p < 0.01 or p < 0.001.
measurementIn a moderation analysis of university students in Tokyo and London, the relationship between sleep quality (measured by PSQI) and RAVLT performance showed a standardized regression coefficient (β) of -0.35 (p < 0.001), indicating that poorer sleep quality is associated with lower verbal learning and memory scores across both cities.
claimUniversity students in Tokyo and London exhibit an inverse relationship between sleep quality and cognitive performance, where poorer sleep quality (indicated by higher Pittsburgh Sleep Quality Index scores) is associated with lower performance on cognitive tests.
measurementThe interaction between Pittsburgh Sleep Quality Index (PSQI) scores and city location significantly affects Rey Auditory Verbal Learning Test (RAVLT) performance (β = −0.20, p = 0.03), indicating the relationship between sleep quality and verbal memory differs between Tokyo and London.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and WCST performance is −0.42 (p < 0.001) for students in Tokyo and −0.28 (p < 0.001) for students in London.
measurementPoorer sleep quality, as measured by the Pittsburgh Sleep Quality Index (PSQI), is significantly associated with slower Stroop Test performance (β = −0.25, p < 0.001) across both Tokyo and London student populations.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Wisconsin Card Sorting Test (WCST) performance is -0.42 in Tokyo and -0.28 in London, indicating a stronger negative relationship between sleep quality and cognitive flexibility in Tokyo.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop test performance is −0.35 (p < 0.001) for students in Tokyo and −0.20 (p < 0.01) for students in London.
measurementStudents in Tokyo exhibited lower sleep quality than students in London, as evidenced by average Pittsburgh Sleep Quality Index (PSQI) scores reflecting a more significant occurrence of sleep disturbances.
measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance does not differ significantly between students in Tokyo and London (β = −0.10, p = 0.21).
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and RAVLT performance is −0.40 (p < 0.001) for students in Tokyo and −0.25 (p < 0.01) for students in London.
measurementIn a moderation analysis of university students in Tokyo and London, the interaction between sleep quality (PSQI) and city on RAVLT performance showed a standardized regression coefficient (β) of -0.20 (p = 0.03), suggesting the relationship between sleep quality and verbal learning and memory is significantly different between the two cities.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and RPM performance is −0.30 (p < 0.001) for students in Tokyo and −0.15 (p = 0.04) for students in London.
measurementThe relationship between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance does not differ significantly between Tokyo and London (β = −0.10, p = 0.21), suggesting the magnitude of the effect of sleep quality on attention and executive function is consistent across both cultural contexts.
measurementPoorer sleep quality, as measured by the Pittsburgh Sleep Quality Index (PSQI), is significantly associated with lower Raven's Progressive Matrices (RPM) non-verbal reasoning scores (β = −0.20, p < 0.001) across both Tokyo and London student populations.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Stroop Test performance is −0.35 in Tokyo and −0.20 in London.
claimThe study of 400 university students in Tokyo and London found significant negative correlations between Pittsburgh Sleep Quality Index (PSQI) scores and cognitive performance, indicating that poorer sleep quality correlates with diminished cognitive abilities across domains.
measurementThe correlation between Pittsburgh Sleep Quality Index (PSQI) scores and Rey Auditory Verbal Learning Test (RAVLT) performance is −0.40 in Tokyo and −0.25 in London.
claimThe impact of sleep quality on cognitive functions, as measured by correlations between Pittsburgh Sleep Quality Index (PSQI) scores and cognitive assessments, is more pronounced among students in Tokyo compared to students in London.
claimA study investigating university students in Tokyo, Japan, and London, UK, found significant negative associations between sleep quality (measured by the Pittsburgh Sleep Quality Index) and cognitive performance across domains including verbal learning and memory (RAVLT), attention and executive function (Stroop Test), non-verbal reasoning (RPM), and cognitive flexibility (WCST).
measurementThe interaction term between sleep quality (measured by the Pittsburgh Sleep Quality Index) and city location (Tokyo vs. London) on Wisconsin Card Sorting Test (WCST) performance resulted in β = −0.12 and p = 0.09, indicating the result is not statistically significant at the conventional p < 0.05 level.