condition mean min max ZT0-3 19.499391052500002 11.877658695000001 27.12112341 ZT4-7 14.115716764999998 7.6809218875 20.5505116425 ZT8-11 7.25491656925 6.125529953999999 8.3843031845 ZT12-15 12.00323085625 7.0113327855000005 16.995128927 ZT16-19 11.13523118525 10.489583595500001 11.780878775 ZT20-23 96.35473543500001 49.53061597 143.1788549