condition mean min max ZT0-3 3.995735 3.89922 4.09225 ZT4-7 3.891425 3.891425 3.891425 ZT8-11 2.7308649999999997 2.7308649999999997 2.7308649999999997 ZT12-15 0 0 0 ZT16-19 3.97886 3.97886 3.97886 ZT20-23 4.865774999999999 4.865774999999999 4.865774999999999