condition	mean	min	max
4 h after light	6.5346	6.41411	6.68174
8 h after light	6.167963333333334	6.095680000000001	6.2224
12 h after light	6.064573333333334	5.99224	6.12995
4 h after dark	6.518973333333333	6.1616599999999995	6.88163
8 h after dark	6.3244	5.88922	6.57458
12 h after dark	6.66756	6.4839	6.76421