condition	mean	min	max
4 h after light	6.1954400000000005	6.07815	6.27913
8 h after light	6.237066666666666	6.05541	6.42601
12 h after light	6.2969100000000005	6.0658900000000004	6.71082
4 h after dark	6.510186666666667	6.22524	6.738289999999999
8 h after dark	6.5257700000000005	6.22267	6.759460000000001
12 h after dark	6.523816666666667	6.26125	6.95262