condition	mean	min	max
4 h after light	6.57087	6.4459	6.7904100000000005
8 h after light	6.69489	6.37184	7.0168
12 h after light	6.50499	6.33938	6.62132
4 h after dark	6.450833333333334	6.211930000000001	6.7457199999999995
8 h after dark	6.396873333333333	6.197369999999999	6.536969999999999
12 h after dark	6.317886666666666	6.272480000000001	6.40156