condition mean min max ZT0-3 8.650115781250001 3.5502991425 13.74993242 ZT4-7 5.09352579775 4.526797647 5.660253948499999 ZT8-11 5.19656960075 5.015147443 5.3779917585 ZT12-15 2.8313286947500003 2.828096255 2.8345611345000004 ZT16-19 4.60412784525 3.5102850365 5.697970654000001 ZT20-23 7.772752827750001 6.9215570355 8.62394862