condition mean min max ZT0-3 11.533945 11.533945 11.533945 ZT4-7 16.809075 16.809075 16.809075 ZT8-11 23.912326999999998 23.912326999999998 23.912326999999998 ZT12-15 17.992113 17.992113 17.992113 ZT16-19 11.370194 11.370194 11.370194 ZT20-23 11.3605185 11.3605185 11.3605185