condition mean min max ZT0-3 5.969385000000001 4.310185000000001 7.628585 ZT4-7 2.31381 2.31381 2.31381 ZT8-11 3.129555 3.129555 3.129555 ZT12-15 0 0 0 ZT16-19 4.946165 4.946165 4.946165 ZT20-23 2.224815 2.224815 2.224815