condition mean min max ZT0-3 0.324598869 0.225353268 0.42384447 ZT4-7 0.46932243325 0.2706369655 0.668007901 ZT8-11 0.6680072447500001 0.566697008 0.7693174815 ZT12-15 1.3377132672499998 1.160803329 1.5146232055 ZT16-19 2.08745218075 1.7750635765 2.3998407850000003 ZT20-23 2.6241094612499998 1.8915219424999998 3.35669698