condition mean min max ZT0-3 140.05666666666667 110.5455 171.88799999999998 ZT4-7 109.24799999999999 109.24799999999999 109.24799999999999 ZT8-11 112.9935 112.9935 112.9935 ZT12-15 144.22050000000002 141.23250000000002 147.20850000000002 ZT16-19 154.4745 154.4745 154.4745 ZT20-23 199.032 199.032 199.032