condition mean min max ZT0-3 1875.0500000000002 1875.0500000000002 1875.0500000000002 ZT4-7 1785.0 1785.0 1785.0 ZT8-11 1952.3000000000002 1952.3000000000002 1952.3000000000002 ZT12-15 1891.6 1891.6 1891.6 ZT16-19 2207.15 2207.15 2207.15 ZT20-23 1770.4499999999998 1770.4499999999998 1770.4499999999998