condition mean min max ZT0-3 45.85 45.85 45.85 ZT4-7 60.6 60.6 60.6 ZT8-11 36.05 36.05 36.05 ZT12-15 32.2 32.2 32.2 ZT16-19 21.0 21.0 21.0 ZT20-23 56.15 56.15 56.15