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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Sleep Breath. 2013 Aug 9;18(2):257–263. doi: 10.1007/s11325-013-0874-8

Table 2.

Mean CGPA by sleep quality and its components among University students

Variables (N=2173) Mean SD F-test P-value
Sleep quality score 2.61 0.009**
Good sleep 2.90 0.49
Poor sleep 2.84 0.51

Sleep duration 3.95 0.008**
> 7hours 2.88 0.49
6-7hours 2.89 0.50
5-6hours 2.83 0.49
<5 hours 2.77 0.55

Subjective sleep quality 5.33 0.001**
Very good 2.91 0.50
Fairly good 2.86 0.48
Fairly bad 2.81 0.54
Very bad 2.71 0.57

Sleep medication 6.24 0.002**
<once per month 2.88 0.50
< once per week 2.72 0.53
> once per week 2.80 0.46

Sleep efficiency (%) 2.83 0.037*
>85 2.88 0.50
75-84 2.89 0.48
65-74 2.87 0.48
<65 2.77 0.52

Sleep latency score 0.75 0.52
0 2.90 0.51
1 2.86 0.50
2 2.86 0.49
3 2.84 0.50

Day time dysfunction score 3.052 0.027*
0 2.90 0.50
1 2.88 0,49
2 2.82 0,49
3 2.82 0,56

Sleep disturbance score 4.104 0.017*
0 2.95 0.50
1 2.88 0.49
2 &3 2.82 0.51
*

P-value ≤0.05

**

≤ 0.01

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