condition mean min max ZT0-3 274.1 274.1 274.1 ZT4-7 226.8 226.8 226.8 ZT8-11 205.9 205.9 205.9 ZT12-15 247.0 247.0 247.0 ZT16-19 187.45 187.45 187.45 ZT20-23 215.0 215.0 215.0