condition mean min max ZT0-3 0.035264263000000004 0.0 0.07052852600000001 ZT4-7 1.5680485105000002 0.6200086405 2.5160883805000003 ZT8-11 2.97025562 2.8668071365000003 3.0737041035 ZT12-15 4.0899906395 3.1928495444999996 4.9871317345 ZT16-19 5.376512614 4.7157116185 6.0373136095 ZT20-23 8.09102668775 7.253877210500001 8.928176165