condition mean min max ZT0-3 9.220645000000001 9.137395000000001 9.303895 ZT4-7 6.864034999999999 6.864034999999999 6.864034999999999 ZT8-11 1.688105 1.688105 1.688105 ZT12-15 0 0 0 ZT16-19 2.2895250000000003 2.2895250000000003 2.2895250000000003 ZT20-23 3.681695 3.681695 3.681695