condition mean min max ZT0-3 18.45 18.45 18.45 ZT4-7 27.9 27.9 27.9 ZT8-11 16.15 16.15 16.15 ZT12-15 16.6 16.6 16.6 ZT16-19 5.85 5.85 5.85 ZT20-23 4.8 4.8 4.8