condition mean min max ZT0-3 28.65 28.65 28.65 ZT4-7 3.0 3.0 3.0 ZT8-11 56.75 56.75 56.75 ZT12-15 43.5 43.5 43.5 ZT16-19 43.85 43.85 43.85 ZT20-23 49.2 49.2 49.2