condition mean min max ZT0-3 2.9903775 2.9534000000000002 3.027355 ZT4-7 1.33061 1.33061 1.33061 ZT8-11 2.563705 2.563705 2.563705 ZT12-15 0 0 0 ZT16-19 3.520425 3.520425 3.520425 ZT20-23 3.1316249999999997 3.1316249999999997 3.1316249999999997