condition mean min max ZT0-3 0.55810484175 0.33337126250000004 0.7828384209999999 ZT4-7 1.860984241 1.659322118 2.062646364 ZT8-11 4.37206052625 4.016578373 4.727542679500001 ZT12-15 4.32537338625 3.6475425105 5.003204262000001 ZT16-19 2.701774448 2.0826795895 3.3208693064999997 ZT20-23 3.30186505 3.0658125084999996 3.5379175915000003