condition	mean	min	max
4 h after light	19.94725	18.6794	21.2151
8 h after light	18.62645	17.7885	19.4644
12 h after light	17.1269	16.7815	17.4723
4 h after dark	21.4621	20.9496	21.9746
8 h after dark	20.6178	20.0291	21.2065
12 h after dark	19.4018	19.2498	19.5538