In my research, I used the Korean version of Pittsburgh Sleep Quality Index (PSQI-K) which was validated in the study as below:
Sohn, S. I., Kim, D. H., Lee, M. Y., & Cho, Y. W. (2012). The reliability and validity of the Korean version of the Pittsburgh Sleep Quality Index. Sleep and Breathing, 16(3), 803-812.
The previous study suggested the optimal cut-off point of 8.5. However, I am so confused since global PSQI score (ranged 0-21) as well as each PSQI component score (ranged 0-3) have no decimals. Do this cut-off value of 8.5 mean that the real cut-off point is 9 or over?
Hi Kyungmi!
Yes, in clinical practice, the cutoff would be 9 or over. With the PSQI, decimals can sometimes happen, for example, when a patient makes his cross between two boxes. However, most of the time you only get whole numbers, so you would use 9 as the realistic cut-off.
Lukas Retzer Thanks for your kind answer! :) It was really helpful to interpret my data.
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