condition mean min max ZT0-3 345.432039 345.432039 345.432039 ZT4-7 191.66208849999998 191.66208849999998 191.66208849999998 ZT8-11 63.18854 63.18854 63.18854 ZT12-15 143.9383155 143.9383155 143.9383155 ZT16-19 28.1160815 28.1160815 28.1160815 ZT20-23 31.590293 31.590293 31.590293