condition mean min max ZT0-3 19.0132612425 14.12697167 23.899550815 ZT4-7 26.763593919999998 26.32053165 27.206656189999997 ZT8-11 27.439526555 21.013234435 33.865818675 ZT12-15 64.7370533125 55.175676165 74.29843045999999 ZT16-19 89.32080365 85.931052075 92.71055522500001 ZT20-23 92.65370282250001 90.559004345 94.7484013