condition mean min max ZT0-3 18.59255 18.59255 18.59255 ZT4-7 11.924299999999999 11.924299999999999 11.924299999999999 ZT8-11 9.08707 9.08707 9.08707 ZT12-15 15.908050000000001 15.908050000000001 15.908050000000001 ZT16-19 20.45825 20.45825 20.45825 ZT20-23 20.75475 20.75475 20.75475