condition	mean	min	max
4 h after light	6.82805	6.785839999999999	6.8896
8 h after light	6.6960033333333335	6.62622	6.734710000000001
12 h after light	6.67155	6.49022	6.8293800000000005
4 h after dark	6.641766666666667	6.37819	6.84325
8 h after dark	6.697890000000001	6.559830000000001	6.899310000000001
12 h after dark	6.684106666666667	6.59921	6.73163