condition	mean	min	max
4 h after light	6.320003333333333	6.14318	6.49539
8 h after light	6.400013333333334	6.32099	6.50835
12 h after light	6.400816666666667	6.33574	6.50606
4 h after dark	6.492710000000001	6.299980000000001	6.64975
8 h after dark	6.32333	6.17315	6.49164
12 h after dark	6.20542	6.13961	6.2977099999999995