condition mean min max ZT0-3 9.0947325 6.325654999999999 11.86381 ZT4-7 9.081805 9.081805 9.081805 ZT8-11 22.0584 22.0584 22.0584 ZT12-15 0 0 0 ZT16-19 17.502850000000002 17.502850000000002 17.502850000000002 ZT20-23 13.080400000000001 13.080400000000001 13.080400000000001