condition mean min max ZT0-3 2.20573079525 2.1961941069999997 2.2152674835 ZT4-7 2.962370855 2.469156754 3.455584956 ZT8-11 2.56953726275 2.3987538545000002 2.740320671 ZT12-15 3.0352354845000002 2.4226778295 3.6477931395 ZT16-19 2.8736677782499997 2.856556356 2.8907792005 ZT20-23 4.2271533075 4.0882839835 4.3660226315