condition mean min max ZT0-3 54.6 54.6 54.6 ZT4-7 49.7 49.7 49.7 ZT8-11 58.25 58.25 58.25 ZT12-15 111.0 111.0 111.0 ZT16-19 130.5 130.5 130.5 ZT20-23 107.9 107.9 107.9