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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Chronobiol Int. 2014 Jan 27;31(4):479–486. doi: 10.3109/07420528.2013.867864

Table 4.

Demographic characteristics and questionnaire scores in MT, NT and ET subjects

MT (N=15) NT (N=15) ET(N=16)
Mean (SD) p
Age (years) 33.3 (6.11) 31.00 (7.54) 29.06 (7.24) 0.228
Gender†
  Female: male 11:4 13:2 12:4 0.626
Education (years) 14.67 (2.06) 16.47 (2.88) 15.50 (2.03) .0219
Korean MEQ 64.20 (5.0) 49.93 (4.23) 36.00 (5.03)* <0.001
K-ESS 7.27 (2.94) 9.20 (3.86) 9.07 (4.45) 0.384
Korean PSQI 4.00 (2.17) 3.87 (1.85) 4.93 (1.59) 0.176
*

p<0.01 (Kruskal Wallis test or †X2 test)

MT: Morning type; NT: Neither type; ET: Evening type

MEQ: Morningness-Eveningness Questionnaire

K-ESS: Korean version of Epworth Sleepiness Scale

PSQI: Pittsburg Sleep Quality Index