condition mean min max ZT0-3 50.130518 50.130518 50.130518 ZT4-7 63.200855499999996 63.200855499999996 63.200855499999996 ZT8-11 52.8855475 52.8855475 52.8855475 ZT12-15 54.8755545 54.8755545 54.8755545 ZT16-19 34.550867499999995 34.550867499999995 34.550867499999995 ZT20-23 46.1700205 46.1700205 46.1700205