condition	mean	min	max
4 h after light	6.545050000000001	6.4787300000000005	6.65563
8 h after light	6.32859	6.14609	6.46486
12 h after light	6.383236666666667	6.1735	6.7866
4 h after dark	6.5153	6.4627099999999995	6.54165
8 h after dark	6.636523333333334	6.29091	6.816610000000001
12 h after dark	6.669536666666667	6.5457	6.751539999999999