condition mean min max ZT0-3 42.956582 42.956582 42.956582 ZT4-7 22.237675000000003 22.237675000000003 22.237675000000003 ZT8-11 27.7471855 27.7471855 27.7471855 ZT12-15 19.6821105 19.6821105 19.6821105 ZT16-19 15.928659500000002 15.928659500000002 15.928659500000002 ZT20-23 14.6552005 14.6552005 14.6552005