condition mean min max ZT0-3 13.464719926666668 12.686346733333334 14.243093120000001 ZT4-7 9.21715698 7.095169254333333 11.339144705666667 ZT8-11 10.3020719115 9.618160400999999 10.985983422 ZT12-15 8.648461430833333 8.619238041666668 8.67768482 ZT16-19 9.4132361835 9.146669624000001 9.679802743 ZT20-23 9.668087035166668 9.484432839333333 9.851741231