condition mean min max ZT0-3 11.976129 11.976129 11.976129 ZT4-7 12.094007999999999 12.094007999999999 12.094007999999999 ZT8-11 10.644327 10.644327 10.644327 ZT12-15 11.6489135 11.6489135 11.6489135 ZT16-19 10.534885500000001 10.534885500000001 10.534885500000001 ZT20-23 10.447326499999999 10.447326499999999 10.447326499999999