condition mean min max ZT0-3 123.8 123.8 123.8 ZT4-7 126.0 126.0 126.0 ZT8-11 80.75 80.75 80.75 ZT12-15 131.9 131.9 131.9 ZT16-19 104.75 104.75 104.75 ZT20-23 114.5 114.5 114.5