condition mean min max ZT0-3 0.36693200000000004 0.36693200000000004 0.36693200000000004 ZT4-7 0.6795220000000001 0.6795220000000001 0.6795220000000001 ZT8-11 1.04013 1.04013 1.04013 ZT12-15 1.50833 1.50833 1.50833 ZT16-19 1.1682793333333332 1.1682793333333332 1.1682793333333332 ZT20-23 1.376425 1.376425 1.376425