condition mean min max ZT0-3 210.06805094999999 184.5756305 235.56047139999998 ZT4-7 138.352900415 122.14390608 154.56189475 ZT8-11 50.1175544825 33.924159665 66.31094929999999 ZT12-15 13.5612146045 12.779804819999999 14.342624389000001 ZT16-19 27.007584465 21.157167864999998 32.858001065 ZT20-23 50.4210115075 46.27169389 54.570329125