condition mean min max ZT0-3 2.8589152587499997 2.0553475225 3.662482995 ZT4-7 2.85000920875 2.338601426 3.3614169915 ZT8-11 4.5176532985 3.492099521 5.543207076 ZT12-15 4.0819509494999995 3.8423187189999997 4.321583179999999 ZT16-19 5.1152112845 4.2472588505 5.9831637185 ZT20-23 4.90845731225 4.6901031005 5.126811524