condition mean min max ZT0-3 8.9426825 7.392825 10.49254 ZT4-7 12.45925 12.45925 12.45925 ZT8-11 16.48585 16.48585 16.48585 ZT12-15 0 0 0 ZT16-19 21.4286 21.4286 21.4286 ZT20-23 20.22855 20.22855 20.22855