condition mean min max ZT0-3 29.027416666666667 27.8047 30.597749999999998 ZT4-7 26.655549999999998 26.655549999999998 26.655549999999998 ZT8-11 17.9434 17.9434 17.9434 ZT12-15 16.102275 15.0177 17.18685 ZT16-19 21.1082 21.1082 21.1082 ZT20-23 26.530250000000002 26.530250000000002 26.530250000000002