condition mean min max ZT0-3 25.75 25.75 25.75 ZT4-7 3.8 3.8 3.8 ZT8-11 22.1 22.1 22.1 ZT12-15 16.6 16.6 16.6 ZT16-19 45.1 45.1 45.1 ZT20-23 17.25 17.25 17.25