condition mean min max ZT0-3 1.09023397825 0.643573365 1.5368945914999999 ZT4-7 4.6056007587500005 3.638698186 5.5725033315 ZT8-11 5.696802016 4.7107229645 6.6828810675 ZT12-15 7.2710545265 5.9817167225 8.560392330500001 ZT16-19 3.77536409475 3.7235216099999997 3.8272065795000003 ZT20-23 3.3496568389999997 3.1126252264999996 3.5866884514999997