Perception of sleep duration in adult patients with suspected obstructive sleep apnea
Fig 1
Scatterplot of Apnea/Hypopnea Index (AHI), subjective and objective Total Sleep Time (TST), and Sleep Perception Index (SPI) in 727 individuals.
Subjective TST value was self-reported by participants, while objective TST value was measured from full polysomnography. SPI was defined as the ratio between the subjective and objective TST. Spearman’s rank correlation coefficient (r) was used to evaluate the strength of association between two variables.