condition mean min max ZT0-3 24.9 24.9 24.9 ZT4-7 1.0 1.0 1.0 ZT8-11 13.25 13.25 13.25 ZT12-15 25.85 25.85 25.85 ZT16-19 8.65 8.65 8.65 ZT20-23 16.8 16.8 16.8