condition mean min max ZT0-3 17.0 17.0 17.0 ZT4-7 3.8 3.8 3.8 ZT8-11 7.6 7.6 7.6 ZT12-15 3.2 3.2 3.2 ZT16-19 28.25 28.25 28.25 ZT20-23 13.45 13.45 13.45