condition	mean	min	max
4 h after light	19658.4	19658.4	19658.4
8 h after light	18706.55	18602.3	18810.8
12 h after light	18278.3	16349.6	20207.0
4 h after dark	19742.75	16538.4	22947.1
8 h after dark	18882.65	16157.1	21608.2
12 h after dark	19266.35	18710.7	19822.0