condition mean min max ZT0-3 5.1730875 4.27589 6.070285 ZT4-7 4.567855 4.567855 4.567855 ZT8-11 3.0522799999999997 3.0522799999999997 3.0522799999999997 ZT12-15 0 0 0 ZT16-19 3.858755 3.858755 3.858755 ZT20-23 5.085325 5.085325 5.085325