condition mean min max ZT0-3 7.0291440215000005 6.946117709000001 7.112170334 ZT4-7 6.7490747964999995 6.440382104499999 7.0577674885 ZT8-11 6.1110537879999995 5.108746582 7.113360994 ZT12-15 11.29088854025 7.9942440905000005 14.58753299 ZT16-19 9.5196649585 9.457839839 9.581490078 ZT20-23 7.29213325925 7.283338547 7.3009279715