condition mean min max ZT0-3 69.6 69.6 69.6 ZT4-7 98.6 98.6 98.6 ZT8-11 124.0 124.0 124.0 ZT12-15 162.75 162.75 162.75 ZT16-19 114.25 114.25 114.25 ZT20-23 102.75 102.75 102.75