condition mean min max ZT0-3 1.85 1.85 1.85 ZT4-7 0.7 0.7 0.7 ZT8-11 14.45 14.45 14.45 ZT12-15 7.35 7.35 7.35 ZT16-19 2.0 2.0 2.0 ZT20-23 21.0 21.0 21.0