condition mean min max ZT0-3 1.8827656666666668 0.887842 2.6503300000000003 ZT4-7 1.1173030000000002 1.1173030000000002 1.1173030000000002 ZT8-11 1.0012634999999999 1.0012634999999999 1.0012634999999999 ZT12-15 2.78857 2.7408799999999998 2.8362600000000002 ZT16-19 4.396805 4.396805 4.396805 ZT20-23 4.76474 4.76474 4.76474