condition mean min max ZT0-3 178.3 178.3 178.3 ZT4-7 160.0 160.0 160.0 ZT8-11 137.25 137.25 137.25 ZT12-15 178.25 178.25 178.25 ZT16-19 190.75 190.75 190.75 ZT20-23 215.75 215.75 215.75