condition mean min max ZT0-3 14.795375 13.8506 15.74015 ZT4-7 11.10215 11.10215 11.10215 ZT8-11 12.71685 12.71685 12.71685 ZT12-15 0 0 0 ZT16-19 16.22925 16.22925 16.22925 ZT20-23 15.82255 15.82255 15.82255