condition	mean	min	max
4 h after light	5.4	5.4	5.4
8 h after light	5.0	4.3	5.7
12 h after light	6.35	4.7	8.0
4 h after dark	5.0	4.3	5.7
8 h after dark	5.15	4.6	5.7
12 h after dark	5.65	5.3	6.0