condition mean min max ZT0-3 119.322868 119.322868 119.322868 ZT4-7 137.013985 137.013985 137.013985 ZT8-11 130.231978 130.231978 130.231978 ZT12-15 115.050082 115.050082 115.050082 ZT16-19 78.34267750000001 78.34267750000001 78.34267750000001 ZT20-23 40.329091 40.329091 40.329091