condition mean min max ZT0-3 273.217872 273.217872 273.217872 ZT4-7 170.7496205 170.7496205 170.7496205 ZT8-11 226.88712700000002 226.88712700000002 226.88712700000002 ZT12-15 268.8655655 268.8655655 268.8655655 ZT16-19 360.78051849999997 360.78051849999997 360.78051849999997 ZT20-23 360.715964 360.715964 360.715964