condition mean min max ZT0-3 23.2449 18.3373 28.1525 ZT4-7 18.854599999999998 18.854599999999998 18.854599999999998 ZT8-11 25.4603 25.4603 25.4603 ZT12-15 39.4273125 30.321625 48.533 ZT16-19 40.74093333333333 34.13796666666667 47.3439 ZT20-23 0 0 0