condition mean min max ZT0-3 1.4581285 1.4581285 1.4581285 ZT4-7 1.52722 1.52722 1.52722 ZT8-11 0.6887295 0.6887295 0.6887295 ZT12-15 0.6561904999999999 0.6561904999999999 0.6561904999999999 ZT16-19 1.139256 1.139256 1.139256 ZT20-23 0.919289 0.919289 0.919289