condition mean min max ZT0-3 0.64318079025 0.28256298 1.0037986005 ZT4-7 6.660299022499999 4.176892913 9.143705132 ZT8-11 23.32966957725 15.2636774795 31.395661675 ZT12-15 53.6359895625 46.056937935 61.21504119 ZT16-19 44.038491125 41.685301445 46.391680805 ZT20-23 33.699825445 30.93097427 36.46867662