condition mean min max ZT0-3 12.63032262075 6.597017661500001 18.66362758 ZT4-7 9.46324868175 7.1651915385 11.761305825 ZT8-11 12.3033861 12.06529503 12.54147717 ZT12-15 9.572411779500001 7.699470944 11.445352615000001 ZT16-19 12.96621507075 9.7247654565 16.207664685 ZT20-23 25.212763565 19.901869194999996 30.523657935000003