condition	mean	min	max
4 h after light	7.91569	7.606139999999999	8.11145
8 h after light	7.78903	7.349410000000001	8.05533
12 h after light	7.8355966666666665	7.485339999999999	8.012260000000001
4 h after dark	8.17511	7.695310000000001	8.452739999999999
8 h after dark	8.272856666666666	7.84351	8.52577
12 h after dark	8.494866666666667	8.25935	8.72843