condition mean min max ZT0-3 4.15 4.15 4.15 ZT4-7 1.4 1.4 1.4 ZT8-11 8.0 8.0 8.0 ZT12-15 2.8 2.8 2.8 ZT16-19 18.55 18.55 18.55 ZT20-23 8.05 8.05 8.05