condition mean min max ZT0-3 41.274966666666664 36.15495 50.84525 ZT4-7 25.7553 25.7553 25.7553 ZT8-11 16.2108 16.2108 16.2108 ZT12-15 28.3346 26.295749999999998 30.37345 ZT16-19 21.115450000000003 21.115450000000003 21.115450000000003 ZT20-23 27.2603 27.2603 27.2603