condition	mean	min	max
4 h after light	6.53789	6.46091	6.65488
8 h after light	6.451703333333334	6.26807	6.616060000000001
12 h after light	6.37899	6.19528	6.52265
4 h after dark	6.359883333333333	6.1822099999999995	6.45828
8 h after dark	6.33177	6.21765	6.55819
12 h after dark	6.3820033333333335	6.35126	6.39775