condition mean min max ZT0-3 1.4747724987500002 1.4277339390000001 1.5218110585 ZT4-7 1.25282284325 1.2422275605 1.263418126 ZT8-11 2.050083126 1.4300570344999999 2.6701092175000003 ZT12-15 2.931303609 2.8063783805 3.0562288375 ZT16-19 2.81337881325 2.4820957769999996 3.1446618495 ZT20-23 3.05836642 2.8838261935 3.2329066465