condition	mean	min	max
4 h after light	6.51036	6.40041	6.6532100000000005
8 h after light	6.594133333333334	6.3518	6.715730000000001
12 h after light	6.66118	6.47494	6.79922
4 h after dark	6.7151266666666665	6.3115	7.05823
8 h after dark	6.48253	5.99631	6.85411
12 h after dark	6.672213333333333	6.52475	6.828119999999999