condition mean min max ZT0-3 4.9 4.9 4.9 ZT4-7 2.8 2.8 2.8 ZT8-11 3.05 3.05 3.05 ZT12-15 23.3 23.3 23.3 ZT16-19 8.45 8.45 8.45 ZT20-23 5.1 5.1 5.1