Table 2 Descriptive statistics of the subjective sleep questionnaire scores.

From: The relationship between subjective sleep quality and cognitive performance in healthy young adults: Evidence from three empirical studies

 

Obtainable scores

Mean (SD)

Good sleepers

Moderate sleepers

Poor sleepers

Scores (percentage of participants)

PSQI

0–9

    

  All participants

 

2.99 (1.57)

0–1 (15.3%)

2–4 (66.4%)

5–8 (18.3%)

  Study 2

 

2.54 (1.29)

   

AIS

0–24

    

  All participants

 

3.98 (2.66)

0–2 (35%)

3–6 (50%)

7–17 (15%)

  Study 2

 

3.41 (2.09)

   

GSQS

0–14

    

  Study2

 

2.86 (2.87)

0–1 (40%)

2–7 (53%)

8–13 (7%)

Sleep dairy

0–12

    

  Study 2

 

1.38 (1.22)

0–1 (60%)

2–5 (40%)

 
  1. Note: PSQI = Pittsburgh Sleep Quality Index, AIS = Athens Insomnia Scale, GSQS = Groningen Sleep Quality Scale.
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