condition mean min max ZT0-3 9469.539749 9469.539749 9469.539749 ZT4-7 8934.893904 8934.893904 8934.893904 ZT8-11 6843.262082 6843.262082 6843.262082 ZT12-15 8565.506154499999 8565.506154499999 8565.506154499999 ZT16-19 6563.075881000001 6563.075881000001 6563.075881000001 ZT20-23 5377.4635794999995 5377.4635794999995 5377.4635794999995