condition	mean	min	max
4 h after light	18.21165	17.7757	18.6476
8 h after light	8.47815	8.39144	8.56486
12 h after light	7.22999	6.40992	8.05006
4 h after dark	12.0064	10.7587	13.2541
8 h after dark	15.2329	14.691	15.7748
12 h after dark	18.382649999999998	17.8613	18.904