condition mean min max ZT0-3 4.553055595749999 4.291540689 4.8145705025 ZT4-7 0.9749532135 0.6859678375 1.2639385895 ZT8-11 1.47584320175 0.9705003590000001 1.9811860445 ZT12-15 4.11886695425 3.7329159795 4.504817929 ZT16-19 6.09017408025 5.4113074625 6.7690406979999995 ZT20-23 9.320334366 7.4424460205 11.1982227115