condition mean min max ZT0-3 0.6745046666666666 0.588138 0.821623 ZT4-7 0.442158 0.442158 0.442158 ZT8-11 0.5972775 0.5972775 0.5972775 ZT12-15 1.0579885 1.0286845 1.0872925 ZT16-19 0.3034455 0.3034455 0.3034455 ZT20-23 1.0965945 1.0965945 1.0965945