condition mean min max ZT0-3 227.150451 227.150451 227.150451 ZT4-7 1813.067975 1813.067975 1813.067975 ZT8-11 1983.0822265000002 1983.0822265000002 1983.0822265000002 ZT12-15 1569.52795 1569.52795 1569.52795 ZT16-19 254.64790200000002 254.64790200000002 254.64790200000002 ZT20-23 108.9619625 108.9619625 108.9619625