condition mean min max ZT0-3 34.5865 34.5865 34.5865 ZT4-7 26.49295 26.49295 26.49295 ZT8-11 22.65445 22.65445 22.65445 ZT12-15 20.24875 20.24875 20.24875 ZT16-19 32.657650000000004 32.657650000000004 32.657650000000004 ZT20-23 36.09865 36.09865 36.09865