condition	mean	min	max
4 h after light	7.13115	7.059760000000001	7.21935
8 h after light	6.940093333333333	6.6495	7.11379
12 h after light	7.08684	7.00783	7.165589999999999
4 h after dark	7.322373333333333	7.1711800000000006	7.457489999999999
8 h after dark	7.154350000000001	6.950310000000001	7.433860000000001
12 h after dark	7.36294	7.07005	7.530069999999999