condition mean min max ZT0-3 4.9 4.9 4.9 ZT4-7 5.0 5.0 5.0 ZT8-11 2.55 2.55 2.55 ZT12-15 4.75 4.75 4.75 ZT16-19 2.3 2.3 2.3 ZT20-23 8.3 8.3 8.3