condition	mean	min	max
4 h after light	17.121779	16.036562	18.206996
8 h after light	14.5528885	14.533038	14.572739
12 h after light	16.107670499999998	13.85437	18.360971
4 h after dark	18.877110000000002	15.970786	21.783434
8 h after dark	14.7537205	13.953664	15.553777
12 h after dark	15.439848	15.439848	15.439848