condition mean min max ZT0-3 72.85 72.85 72.85 ZT4-7 85.6 85.6 85.6 ZT8-11 91.65 91.65 91.65 ZT12-15 78.5 78.5 78.5 ZT16-19 78.15 78.15 78.15 ZT20-23 56.05 56.05 56.05