condition mean min max ZT0-3 111.745653 111.745653 111.745653 ZT4-7 67.723377 67.723377 67.723377 ZT8-11 63.1460215 63.1460215 63.1460215 ZT12-15 230.820168 230.820168 230.820168 ZT16-19 78.477889 78.477889 78.477889 ZT20-23 386.018796 386.018796 386.018796