condition mean min max ZT0-3 691.935614 691.935614 691.935614 ZT4-7 415.33560750000004 415.33560750000004 415.33560750000004 ZT8-11 247.98364700000002 247.98364700000002 247.98364700000002 ZT12-15 179.177856 179.177856 179.177856 ZT16-19 425.120933 425.120933 425.120933 ZT20-23 660.188787 660.188787 660.188787