condition mean min max ZT0-3 12.922218090250002 5.836495337000001 20.007940843500002 ZT4-7 28.4369781575 27.176094560000003 29.697861754999998 ZT8-11 18.185161567500003 18.069700475 18.300622660000002 ZT12-15 7.70816941825 3.833554059 11.582784777499999 ZT16-19 7.55392765725 5.228955783 9.8788995315 ZT20-23 26.57442505 21.14832345 32.00052665