condition mean min max ZT0-3 1.24855538075 0.7889889815000001 1.70812178 ZT4-7 1.79998314425 1.0493252979999999 2.5506409905000003 ZT8-11 5.42436911575 5.4204781295 5.428260102 ZT12-15 3.4499525550000003 2.5468909005 4.3530142095 ZT16-19 2.4732156675 2.4276690135 2.5187623215 ZT20-23 2.66014417725 2.4685122269999997 2.8517761275