condition mean min max ZT0-3 35.54083333333333 25.73675 45.9833 ZT4-7 20.141750000000002 20.141750000000002 20.141750000000002 ZT8-11 30.6824 30.6824 30.6824 ZT12-15 47.110475 45.619 48.60195 ZT16-19 56.164 56.164 56.164 ZT20-23 68.2065 68.2065 68.2065