condition mean min max ZT0-3 13.0396842365 9.994099023 16.08526945 ZT4-7 5.21460772825 4.24315114 6.1860643164999995 ZT8-11 12.653788274750001 6.0148568155 19.292719734000002 ZT12-15 20.482786349999998 19.344652775 21.620919925 ZT16-19 17.1587186 15.863877485 18.453559714999997 ZT20-23 17.2715515275 16.75351244 17.789590615