condition mean min max ZT0-3 771.645846675 553.44798705 989.8437062999999 ZT4-7 388.72899155000005 258.86736790000003 518.5906152 ZT8-11 209.6627218175 103.600842345 315.72460129 ZT12-15 5.81078452375 0.14515691949999998 11.476412128 ZT16-19 0.27029706249999996 0.2469462625 0.29364786249999997 ZT20-23 0.20537261499999998 0.0 0.41074522999999996