condition mean min max ZT0-3 2.2500466105 1.320153638 3.1799395830000003 ZT4-7 3.715149766 3.157427622 4.27287191 ZT8-11 7.828132141 6.792495372000001 8.86376891 ZT12-15 7.59826568125 7.2137632494999995 7.9827681130000006 ZT16-19 3.7713647445 3.6594451125000003 3.8832843765 ZT20-23 4.06649435925 4.0305480895 4.102440629