condition mean min max ZT0-3 0.6588788012500001 0.216622123 1.1011354795000001 ZT4-7 1.5830887705 1.422023292 1.7441542490000002 ZT8-11 2.021761682 1.9654166604999999 2.0781067035 ZT12-15 2.08303305675 1.938045637 2.2280204765000002 ZT16-19 2.1589868704999997 2.0594080065 2.2585657345 ZT20-23 2.954769932 2.884623394 3.02491647