condition mean min max ZT0-3 2.02908070525 1.9133022805 2.14485913 ZT4-7 2.79019928925 2.351598952 3.2287996265 ZT8-11 3.9819936327500005 3.1668690760000002 4.797118189500001 ZT12-15 5.63231275425 4.8467893135 6.4178361950000005 ZT16-19 3.60479066675 3.5698368535 3.63974448 ZT20-23 3.9662683845 3.4755315975 4.4570051715000005