condition	mean	min	max
4 h after light	19057.6	19057.6	19057.6
8 h after light	19095.0	18902.9	19287.1
12 h after light	19594.4	16993.1	22195.7
4 h after dark	21698.7	19560.7	23836.7
8 h after dark	18431.95	17986.9	18877.0
12 h after dark	18360.6	18061.6	18659.6