condition	mean	min	max
0 h after light	18.887749999999997	17.9427	19.8328
4 h after light	3.90101	3.61794	4.18408
8 h after light	2.901185	2.33384	3.46853
4 h after dark	4.29819	3.96276	4.63362
8 h after dark	6.137325000000001	5.59312	6.68153
12 h after dark	9.241895	8.44979	10.034