condition mean min max ZT0-3 15.8106 15.8106 15.8106 ZT4-7 16.8367 16.8367 16.8367 ZT8-11 12.49795 12.49795 12.49795 ZT12-15 12.253 12.253 12.253 ZT16-19 14.3869 14.3869 14.3869 ZT20-23 13.67875 13.67875 13.67875