condition mean min max ZT0-3 61.2375252425 55.098088755 67.37696173 ZT4-7 10.64231733325 7.144051171 14.1405834955 ZT8-11 13.65778144575 8.5056772915 18.8098856 ZT12-15 19.1228980975 18.19746776 20.048328435000002 ZT16-19 22.37413546 18.350921645 26.397349275000003 ZT20-23 46.9705167625 42.846738445 51.094295079999995