condition mean min max ZT0-3 6.906471206499999 5.794314504 8.018627909 ZT4-7 10.21305377875 9.5205923605 10.905515197 ZT8-11 12.83719686425 10.8891595035 14.785234225 ZT12-15 15.98148774 14.980037745 16.982937735 ZT16-19 19.8248316675 17.08997082 22.559692515000002 ZT20-23 32.727308585 25.12891347 40.325703700000005