condition mean min max ZT0-3 4.9289668915 4.077592913 5.78034087 ZT4-7 7.410381117249999 6.446731254 8.374030980499999 ZT8-11 5.539704072000001 4.913757626500001 6.1656505175000005 ZT12-15 2.863053281 2.685261587 3.0408449749999997 ZT16-19 5.93269377525 5.1119519355000005 6.753435615 ZT20-23 5.605752108 4.814635943 6.396868273