condition	mean	min	max
0 h after light	19.14415	18.8797	19.4086
4 h after light	12.1755	11.6554	12.6956
8 h after light	8.205815000000001	7.44459	8.96704
4 h after dark	14.6393	14.4221	14.8565
8 h after dark	16.78135	16.079	17.4837
12 h after dark	18.209	17.0979	19.3201