condition mean min max ZT0-3 27.45 27.45 27.45 ZT4-7 3.2 3.2 3.2 ZT8-11 18.6 18.6 18.6 ZT12-15 5.7 5.7 5.7 ZT16-19 4.55 4.55 4.55 ZT20-23 4.85 4.85 4.85