condition mean min max ZT0-3 8.85 8.85 8.85 ZT4-7 16.9 16.9 16.9 ZT8-11 8.5 8.5 8.5 ZT12-15 26.65 26.65 26.65 ZT16-19 6.7 6.7 6.7 ZT20-23 12.7 12.7 12.7