condition	mean	min	max
4 h after light	8.0	8.0	8.0
8 h after light	17.3	4.7	29.9
12 h after light	19.75	19.1	20.4
4 h after dark	21.8	12.3	31.3
8 h after dark	16.5	13.2	19.8
12 h after dark	20.05	8.9	31.2