condition	mean	min	max
4 h after light	6.68263	6.605589999999999	6.82625
8 h after light	6.81766	6.66748	6.99087
12 h after light	6.627846666666667	6.48921	6.75184
4 h after dark	6.693506666666667	6.560510000000001	6.88997
8 h after dark	6.974653333333333	6.879980000000001	7.0545800000000005
12 h after dark	7.052253333333333	6.90045	7.128539999999999