condition mean min max ZT0-3 1060.295299 1060.295299 1060.295299 ZT4-7 948.9243645 948.9243645 948.9243645 ZT8-11 1164.1240025 1164.1240025 1164.1240025 ZT12-15 1135.6096875 1135.6096875 1135.6096875 ZT16-19 1045.7024895 1045.7024895 1045.7024895 ZT20-23 916.055451 916.055451 916.055451