condition mean min max ZT0-3 1.4748723780000002 1.4721585719999999 1.4775861840000002 ZT4-7 2.2896672755000003 1.6768342875000002 2.9025002635000003 ZT8-11 2.93022645725 2.873321926 2.9871309884999997 ZT12-15 2.4593860042499998 2.0512485335 2.867523475 ZT16-19 2.50812914075 2.1909489005 2.825309381 ZT20-23 4.4317278375 3.8442170620000002 5.019238613