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

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

	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

ISSN: 1880-6805