condition mean min max ZT0-3 83.69549012333334 81.98156113 85.40941911666667 ZT4-7 69.96141087166667 64.90581303 75.01700871333334 ZT8-11 65.40764795 63.693082489999995 67.12221341 ZT12-15 55.58920379333333 50.903442883333334 60.27496470333333 ZT16-19 38.13089883833334 36.21782193666667 40.04397574 ZT20-23 35.914458010000004 34.30854697 37.52036905