condition mean min max ZT0-3 18.038249999999998 15.670449999999999 20.40605 ZT4-7 25.404400000000003 25.404400000000003 25.404400000000003 ZT8-11 19.27175 19.27175 19.27175 ZT12-15 0 0 0 ZT16-19 18.936700000000002 18.936700000000002 18.936700000000002 ZT20-23 17.938699999999997 17.938699999999997 17.938699999999997