condition mean min max ZT0-3 399.928313 399.928313 399.928313 ZT4-7 458.31908450000003 458.31908450000003 458.31908450000003 ZT8-11 410.308894 410.308894 410.308894 ZT12-15 535.3948345 535.3948345 535.3948345 ZT16-19 404.412074 404.412074 404.412074 ZT20-23 531.1087655 531.1087655 531.1087655