condition	mean	min	max
4 h after light	6.564303333333333	6.21727	7.00909
8 h after light	6.536976666666667	6.30622	6.97098
12 h after light	6.465976666666666	6.23379	6.863989999999999
4 h after dark	6.53644	6.23602	7.122260000000001
8 h after dark	6.250783333333334	5.866630000000001	6.68813
12 h after dark	6.31011	6.01445	6.837910000000001