condition mean min max ZT0-3 6.093272042000001 4.825868436 7.360675648 ZT4-7 3.3991717657500002 3.00552029 3.7928232415000003 ZT8-11 2.698748233 2.5653064205000002 2.8321900455 ZT12-15 2.81837773925 2.2549712935 3.381784185 ZT16-19 6.439816781 4.901269182 7.97836438 ZT20-23 17.352092997499998 15.836979444999999 18.86720655