condition mean min max ZT0-3 5.2168725 5.13922 5.294525 ZT4-7 4.361705 4.361705 4.361705 ZT8-11 4.24723 4.24723 4.24723 ZT12-15 0 0 0 ZT16-19 5.165649999999999 5.165649999999999 5.165649999999999 ZT20-23 5.14783 5.14783 5.14783