condition	mean	min	max
0 h after light	21.07715	20.4986	21.6557
4 h after light	11.98495	10.5916	13.3783
8 h after light	10.763355	9.72351	11.8032
4 h after dark	15.94895	11.8903	20.0076
8 h after dark	15.18165	14.2747	16.0886
12 h after dark	20.10295	14.4924	25.7135