condition mean min max ZT0-3 17.12441666666667 12.402650000000001 22.816850000000002 ZT4-7 8.655505000000002 8.655505000000002 8.655505000000002 ZT8-11 12.07142 12.07142 12.07142 ZT12-15 24.377225 23.73695 25.0175 ZT16-19 22.71705 22.71705 22.71705 ZT20-23 27.294649999999997 27.294649999999997 27.294649999999997