condition mean min max ZT0-3 1.315630007 1.1345894970000001 1.4966705169999999 ZT4-7 1.6480346547499998 1.2269204255 2.0691488839999996 ZT8-11 2.0562344 1.9664302560000002 2.146038544 ZT12-15 2.19213814925 1.719696146 2.6645801525 ZT16-19 2.66047968375 2.1217328 3.1992265675000002 ZT20-23 5.091333379 4.325572973 5.857093785