condition mean min max ZT0-3 0.9183703997499999 0.461383031 1.3753577684999998 ZT4-7 2.11025423475 1.652454193 2.5680542765 ZT8-11 3.657975891 3.220290642 4.09566114 ZT12-15 2.105432627 1.5703714115 2.6404938425 ZT16-19 1.9420618555 1.9234762614999998 1.9606474495000001 ZT20-23 1.55493051275 1.192862179 1.9169988464999999