condition mean min max ZT0-3 49.78725 46.83945 51.77865 ZT4-7 49.1526 49.1526 49.1526 ZT8-11 96.3365 96.3365 96.3365 ZT12-15 82.980725 67.4619 98.49955 ZT16-19 76.81135 76.81135 76.81135 ZT20-23 65.0127 65.0127 65.0127