condition mean min max ZT0-3 1.85 1.85 1.85 ZT4-7 7.6 7.6 7.6 ZT8-11 7.4 7.4 7.4 ZT12-15 12.9 12.9 12.9 ZT16-19 2.35 2.35 2.35 ZT20-23 11.7 11.7 11.7