condition mean min max ZT0-3 1034.172814 1034.172814 1034.172814 ZT4-7 996.4010404999999 996.4010404999999 996.4010404999999 ZT8-11 1031.6893955 1031.6893955 1031.6893955 ZT12-15 968.7269855 968.7269855 968.7269855 ZT16-19 1246.71541 1246.71541 1246.71541 ZT20-23 1222.6281055 1222.6281055 1222.6281055