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Table 3 Wake-up time, bed time and sleep hours divided by age groups (Mean ± SD[n])

From: Can breakfast tryptophan and vitamin B6 intake and morning exposure to sunlight promote morning-typology in young children aged 2 to 6 years?

  Aged 2 years Aged 3 to 5 years χ2value df P
Bed time
Weekdays 21.21 ± 0.68(187) 21.45 ± 0.73(602) 39.61 31 0.138
Holidays 21.43 ± 0.69(181) 21.80 ± 0.81(595) 49.98 26 0.003
Weekdays vs. holidays
Difference 0.22 ± 0.43(176) 0.36 ± 0.54(580) 32.83 25 0.135
Wake-up time
Weekdays 6.85 ± 0.76(181) 7.02 ± 0.52(600) 46.35 22 0.002
Holidays 7.26 ± 0.76(181) 7.60 ± 0.81(594) 44.30 28 0.026
Weekdays vs. holidays
Difference 0.41 ± 0.70(181) 0.58 ± 0.61(592) 36.08 34 0.372
Sleep duration
Weekdays 9.65 ± 0.68(176) 9.58 ± 0.69(585) 27.15 37 0.882
Holidays 9.83 ± 0.64(180) 9.80 ± 0.78(587) 23.00 33 0.903
Weekdays vs. holidays
Difference 0.19 ± 0.62(175) 0.22 ± 0.74(574) 33.49 45 0.897