condition mean min max ZT0-3 23.089466666666667 16.13945 28.406550000000003 ZT4-7 12.213000000000001 12.213000000000001 12.213000000000001 ZT8-11 17.05815 17.05815 17.05815 ZT12-15 33.298249999999996 28.0923 38.5042 ZT16-19 28.01225 28.01225 28.01225 ZT20-23 31.855150000000002 31.855150000000002 31.855150000000002