condition mean min max ZT0-3 3.35 3.35 3.35 ZT4-7 16.9 16.9 16.9 ZT8-11 32.8 32.8 32.8 ZT12-15 18.9 18.9 18.9 ZT16-19 33.0 33.0 33.0 ZT20-23 20.35 20.35 20.35