condition mean min max ZT0-3 10.85 10.85 10.85 ZT4-7 28.0 28.0 28.0 ZT8-11 34.0 34.0 34.0 ZT12-15 25.75 25.75 25.75 ZT16-19 26.9 26.9 26.9 ZT20-23 30.25 30.25 30.25