condition mean min max ZT0-3 87.078362 87.078362 87.078362 ZT4-7 56.3853375 56.3853375 56.3853375 ZT8-11 68.18388999999999 68.18388999999999 68.18388999999999 ZT12-15 71.54675499999999 71.54675499999999 71.54675499999999 ZT16-19 81.29178 81.29178 81.29178 ZT20-23 85.9716945 85.9716945 85.9716945