condition mean min max ZT0-3 13.157675000000001 11.786200000000001 14.529150000000001 ZT4-7 7.6089400000000005 7.6089400000000005 7.6089400000000005 ZT8-11 8.81019 8.81019 8.81019 ZT12-15 0 0 0 ZT16-19 11.66845 11.66845 11.66845 ZT20-23 12.62695 12.62695 12.62695