condition mean min max ZT0-3 4.35 4.35 4.35 ZT4-7 45.7 45.7 45.7 ZT8-11 25.8 25.8 25.8 ZT12-15 6.4 6.4 6.4 ZT16-19 21.1 21.1 21.1 ZT20-23 2.85 2.85 2.85