condition	mean	min	max
4 h after light	6.28373	6.109380000000001	6.45584
8 h after light	6.32189	6.135619999999999	6.53308
12 h after light	6.35299	6.12896	6.567089999999999
4 h after dark	6.228573333333333	6.01061	6.36386
8 h after dark	6.05737	5.99688	6.13455
12 h after dark	6.08483	5.95589	6.14942