condition mean min max ZT0-3 117.8 117.8 117.8 ZT4-7 180.9 180.9 180.9 ZT8-11 138.75 138.75 138.75 ZT12-15 239.2 239.2 239.2 ZT16-19 241.3 241.3 241.3 ZT20-23 130.6 130.6 130.6