condition	mean	min	max
4 h after light	7.068295	6.79713	7.33946
8 h after light	9.198785	8.48345	9.91412
12 h after light	18.62435	17.239	20.0097
4 h after dark	19.5873	18.7108	21.1235
8 h after dark	17.3518	15.2346	18.8268
12 h after dark	15.999366666666667	14.7318	16.6449