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. 2012 Aug 1;12:61. doi: 10.1186/1472-6920-12-61

Table 2.

Sleep habits and characteristics of both study groups

Variables Total
(n = 410)
“Excellent”
115 (28%)
“Average”
295 (72%)
P value
Do you feel that you get sufficient sleep?
147 (36.0)
57 (50.0)
90 (30.6)
0.000
ESS
7.71 ± 3.85
6.88 ± 3.64
8.03 ± 3.89
0.007
Subjective feeling of sleepiness during classes
261 (64.9)
63 (55.3)
198 (68.8)
0.010
Weekday bedtime (24 hrs)
00.06 ± 1.58
23.76 ± 1.70
00.17 ± 1.52
0.018
Weekday wake-up time
06.15 ± 1.24
06.03 ±1.33
06.20 ± 1.20
0.196
Weekday TST (hrs)
6.04 ± 1.36
6.28 ±1.45
5.94 ± 1.31
0.026
Weekend bedtime
01.68 ± 2.20
01.14 ± 1.98
01.89 ± 2.25
0.002
Weekend wake-up time
09.69 ± 3.86
09.01 ± 3.73
09.95 ± 3.89
0.029
Weekend TST (hrs)
9.02 ± 2.45
8.96 ± 2.69
9.05 ± 2.36
0.753
Bedtime delay during weekend* 1.75 ± 1.44 1.66 ± 1.42 1.79 ± 1.46 0.447

ESS: Epworth sleepiness scale, TST: total sleep time.

*Bedtime during weekends - bedtime during weekday.