condition mean min max ZT0-3 73.376925 70.30395 76.4499 ZT4-7 58.4908 58.4908 58.4908 ZT8-11 58.853 58.853 58.853 ZT12-15 0 0 0 ZT16-19 84.63034999999999 84.63034999999999 84.63034999999999 ZT20-23 77.5359 77.5359 77.5359