condition mean min max ZT0-3 4.75 4.75 4.75 ZT4-7 4.9 4.9 4.9 ZT8-11 10.1 10.1 10.1 ZT12-15 2.45 2.45 2.45 ZT16-19 2.75 2.75 2.75 ZT20-23 6.15 6.15 6.15