condition	mean	min	max
4 h after light	6.585566666666667	6.5006	6.65189
8 h after light	6.567096666666667	6.3076099999999995	6.7862800000000005
12 h after light	6.689830000000001	6.21443	6.93658
4 h after dark	6.43205	6.360530000000001	6.55523
8 h after dark	6.19594	6.0414900000000005	6.33729
12 h after dark	6.017433333333334	5.91504	6.0925