condition mean min max ZT0-3 3.89468090175 3.281409511 4.5079522925 ZT4-7 7.326265262000001 5.1888539915 9.463676532500001 ZT8-11 12.483834842 10.681605249 14.286064435 ZT12-15 10.86724183925 9.565413763999999 12.1690699145 ZT16-19 6.581453516 6.474437662000001 6.68846937 ZT20-23 7.973077701499999 7.2010418765 8.745113526499999