condition mean min max ZT0-3 0.618403895 0.324299787 0.912508003 ZT4-7 0.9594581775 0.9306702789999999 0.988246076 ZT8-11 1.68201631825 1.5985355145 1.7654971220000002 ZT12-15 1.5101079297500002 1.3364906420000002 1.6837252175000001 ZT16-19 1.8231635075 1.405947712 2.240379303 ZT20-23 2.4254363677499997 2.208494262 2.6423784735