Which instrument is a self-report measure of overall sleep quality?

Which instrument is a self-report measure of overall sleep quality?

• A. Epworth Sleepiness Scale
• B. Sleep Quality Index Questionnaire
• C. Pittsburgh Sleep Quality Index
• D. Insomnia Severity Index

Answer: (C)

The key idea is identifying a self-report tool that captures overall sleep quality across multiple facets. The Pittsburgh Sleep Quality Index is a self-administered questionnaire that assesses seven domains of sleep (subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleep medications, and daytime dysfunction) over the past month and yields a single global score. This global score reflects overall sleep quality, with higher scores indicating poorer sleep. That makes it the best choice for measuring overall sleep quality from the patient’s own perspective. By contrast, the Epworth Sleepiness Scale focuses on daytime sleepiness—how likely someone is to doze in various situations—so it doesn’t measure overall sleep quality. The Insomnia Severity Index targets how severe insomnia symptoms are, not the broader quality of sleep. The Sleep Quality Index Questionnaire isn’t a standard, widely used instrument for this purpose, whereas the Pittsburgh Sleep Quality Index is specifically designed to summarize overall sleep quality in a self-report format.

The key idea is identifying a self-report tool that captures overall sleep quality across multiple facets. The Pittsburgh Sleep Quality Index is a self-administered questionnaire that assesses seven domains of sleep (subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleep medications, and daytime dysfunction) over the past month and yields a single global score. This global score reflects overall sleep quality, with higher scores indicating poorer sleep. That makes it the best choice for measuring overall sleep quality from the patient’s own perspective.

By contrast, the Epworth Sleepiness Scale focuses on daytime sleepiness—how likely someone is to doze in various situations—so it doesn’t measure overall sleep quality. The Insomnia Severity Index targets how severe insomnia symptoms are, not the broader quality of sleep. The Sleep Quality Index Questionnaire isn’t a standard, widely used instrument for this purpose, whereas the Pittsburgh Sleep Quality Index is specifically designed to summarize overall sleep quality in a self-report format.