condition mean min max ZT0-3 1.6961724999999999 1.686145 1.7062 ZT4-7 1.79514 1.79514 1.79514 ZT8-11 1.90334 1.90334 1.90334 ZT12-15 0 0 0 ZT16-19 2.029575 2.029575 2.029575 ZT20-23 2.3073699999999997 2.3073699999999997 2.3073699999999997