condition mean min max ZT0-3 32.03183333333333 27.798466666666666 36.2652 ZT4-7 30.043 30.043 30.043 ZT8-11 36.253299999999996 36.253299999999996 36.253299999999996 ZT12-15 56.2521 45.4908 67.0134 ZT16-19 53.1691 53.1691 53.1691 ZT20-23 37.89 37.89 37.89