condition	mean	min	max
4 h after light	6.752895	4.93553	8.57026
8 h after light	4.45101	3.57034	5.33168
12 h after light	5.21169	4.3187	6.10468
4 h after dark	14.1589	13.1616	15.1562
8 h after dark	18.89215	16.9348	20.8495
12 h after dark	14.1491	12.6358	15.6624