condition	mean	min	max
4 h after light	2.3	2.3	2.3
8 h after light	2.85	2.1	3.6
12 h after light	1.75	1.7	1.8
4 h after dark	2.4	1.8	3.0
8 h after dark	2.55	1.9	3.2
12 h after dark	2.2	2.0	2.4