condition mean min max ZT0-3 203.405418 203.405418 203.405418 ZT4-7 129.57101749999998 129.57101749999998 129.57101749999998 ZT8-11 78.5772155 78.5772155 78.5772155 ZT12-15 92.5652095 92.5652095 92.5652095 ZT16-19 50.3922015 50.3922015 50.3922015 ZT20-23 54.560787 54.560787 54.560787