condition mean min max ZT0-3 5.48423 3.02496 7.209465 ZT4-7 4.00488 4.00488 4.00488 ZT8-11 2.924835 2.924835 2.924835 ZT12-15 3.1072475 3.07587 3.138625 ZT16-19 4.48764 4.48764 4.48764 ZT20-23 6.247755 6.247755 6.247755