condition mean min max ZT0-3 22.85 22.85 22.85 ZT4-7 169.5 169.5 169.5 ZT8-11 121.3 121.3 121.3 ZT12-15 56.9 56.9 56.9 ZT16-19 3.55 3.55 3.55 ZT20-23 13.95 13.95 13.95