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. 2019 Aug 19;19:225. doi: 10.1186/s12877-019-1248-2

Table 7.

Spearman’s rank correlation coefficient between the AIS, ESS, and ISI results in the studied group in general

AIS ESS ISI
rs p rs p rs p
AIS – – 0.261 < 0.001* 0.795 < 0.001*
ESS 0.261 < 0.001* – – 0.331 < 0.001*
ISI 0.795 < 0.001* 0.331 < 0.001* – –

Abbreviations: AIS Athens Insomnia Scale, ESS Epworth Sleepiness Scale, ISI Insomnia Severity Index, rs Spearman’s rank correlation coefficient, p p-value, * statistically significant value