condition mean min max ZT0-3 46.324079155 44.93184196 47.71631635 ZT4-7 37.29234693 34.799027665 39.785666195000005 ZT8-11 11.658953800750002 8.438064841000001 14.8798427605 ZT12-15 9.63478549175 7.3454083085 11.924162675 ZT16-19 22.6896975275 19.2449627 26.134432355 ZT20-23 32.889980905 32.04622268 33.733739130000004