condition mean min max ZT0-3 1.09842215775 0.477531437 1.7193128785 ZT4-7 4.6241384445 2.9139144574999998 6.334362431500001 ZT8-11 12.873278519000001 9.704207903 16.042349135000002 ZT12-15 10.673337508500001 8.692033176 12.654641841 ZT16-19 4.62023960775 4.577010391 4.663468824500001 ZT20-23 4.376485718 3.7512581845 5.0017132515