Table 1 Two-way ANOVA results for first and last time of daily exposure to 50-lux light intensity.

	Year		Day of the week		Interaction
First daily 50-lux light exposure	F_{(1, 331)} = 18.2	P < 0.0001	F_{(1, 331)} = 258.1	P < 0.0001	F_{(1, 331)} = 3.7	P = 0.0557
Last daily 50-lux light exposure	F_{(1, 331)} = 6.2	P = 0.0136	F_{(1, 331)} = 111.0	P < 0.0001	F_{(1, 331)} = 0.01	P = 0.92