condition mean min max ZT0-3 0.8724998447500001 0.8534857575000001 0.8915139320000001 ZT4-7 0.806411057 0.561466006 1.051356108 ZT8-11 2.458192346 1.5608416255000002 3.3555430665 ZT12-15 3.31345147325 3.312022807 3.3148801395 ZT16-19 2.8071354024999997 2.270890303 3.3433805019999996 ZT20-23 5.13266443275 4.002003342 6.263325523500001