condition	mean	min	max
4 h after light	4.0	4.0	4.0
8 h after light	6.1	4.6	7.6
12 h after light	18.9	6.0	31.8
4 h after dark	9.5	8.0	11.0
8 h after dark	8.4	7.5	9.3
12 h after dark	9.6	6.5	12.7