condition mean min max ZT0-3 8.45 8.45 8.45 ZT4-7 5.9 5.9 5.9 ZT8-11 1.6 1.6 1.6 ZT12-15 4.4 4.4 4.4 ZT16-19 5.85 5.85 5.85 ZT20-23 4.3 4.3 4.3