condition mean min max ZT0-3 6.2175875000000005 3.973395 8.461780000000001 ZT4-7 3.66892 3.66892 3.66892 ZT8-11 10.475385 10.475385 10.475385 ZT12-15 0 0 0 ZT16-19 10.960895 10.960895 10.960895 ZT20-23 14.34105 14.34105 14.34105