condition mean min max ZT0-3 2.9985775502500003 2.325464527 3.6716905735000003 ZT4-7 12.433489051 7.519666772 17.34731133 ZT8-11 24.5488363275 21.790260515 27.30741214 ZT12-15 17.8734384045 12.375629934 23.371246874999997 ZT16-19 4.170822105 3.2349623679999997 5.106681842 ZT20-23 2.09666534575 1.876665493 2.3166651985