condition mean min max ZT0-3 274.85 274.85 274.85 ZT4-7 113.7 113.7 113.7 ZT8-11 133.7 133.7 133.7 ZT12-15 83.65 83.65 83.65 ZT16-19 69.0 69.0 69.0 ZT20-23 115.2 115.2 115.2