condition mean min max ZT0-3 0.0192661545 0.0 0.038532309 ZT4-7 0.66546453825 0.15992935349999998 1.170999723 ZT8-11 4.251253049999999 3.2121487044999997 5.290357395499999 ZT12-15 4.6449891875 4.304094568 4.9858838070000004 ZT16-19 2.6249779020000004 2.4249887795000005 2.8249670245 ZT20-23 3.02871133425 2.96531658 3.0921060885