condition mean min max ZT0-3 19.6236824975 17.068179784999998 22.17918521 ZT4-7 10.122915654 9.085405993 11.160425315000001 ZT8-11 14.6089831975 12.845861645 16.372104750000002 ZT12-15 17.4369905725 15.203383565 19.67059758 ZT16-19 18.973665947500002 16.056997565 21.89033433 ZT20-23 28.264894585 26.82765837 29.7021308