condition mean min max ZT0-3 486.051385 486.051385 486.051385 ZT4-7 203.5180515 203.5180515 203.5180515 ZT8-11 192.820166 192.820166 192.820166 ZT12-15 230.8474415 230.8474415 230.8474415 ZT16-19 230.89862899999997 230.89862899999997 230.89862899999997 ZT20-23 374.4394625 374.4394625 374.4394625