condition mean min max ZT0-3 22.891084672 4.734400684 41.04776866 ZT4-7 3.9563483689999996 2.4701062905 5.4425904475 ZT8-11 11.39233713775 7.4120395425 15.372634732999998 ZT12-15 15.8212701 15.44094939 16.20159081 ZT16-19 12.23559455475 11.5649830015 12.906206108 ZT20-23 10.52414113875 9.9556494725 11.092632805000001