condition	mean	min	max
4 h after light	6.194513333333333	6.05615	6.4054400000000005
8 h after light	6.229316666666667	5.988919999999999	6.57715
12 h after light	6.096593333333334	6.02913	6.2188
4 h after dark	6.24897	6.14578	6.40644
8 h after dark	6.05488	5.65458	6.323519999999999
12 h after dark	6.19705	5.963419999999999	6.51473