condition mean min max ZT0-3 44.735600405 39.94942219 49.52177862 ZT4-7 39.5221255325 33.899923005000005 45.14432806 ZT8-11 45.1708396875 40.467603425 49.87407595 ZT12-15 30.3651975475 27.507565800000002 33.222829295 ZT16-19 37.06914997 32.477922945 41.660376995 ZT20-23 60.740653567500004 51.945654935 69.5356522