condition mean min max ZT0-3 76.878125 69.1533 84.60294999999999 ZT4-7 68.40729999999999 68.40729999999999 68.40729999999999 ZT8-11 72.22313333333334 72.22313333333334 72.22313333333334 ZT12-15 102.3199375 88.503875 116.136 ZT16-19 89.5222 83.5496 95.4948 ZT20-23 0 0 0