condition mean min max ZT0-3 39.75536666666667 28.107599999999998 46.39435 ZT4-7 21.69905 21.69905 21.69905 ZT8-11 25.27075 25.27075 25.27075 ZT12-15 33.587 31.5806 35.5934 ZT16-19 47.511300000000006 47.511300000000006 47.511300000000006 ZT20-23 53.768299999999996 53.768299999999996 53.768299999999996