condition mean min max ZT0-3 18.9 18.9 18.9 ZT4-7 28.9 28.9 28.9 ZT8-11 10.55 10.55 10.55 ZT12-15 22.75 22.75 22.75 ZT16-19 49.1 49.1 49.1 ZT20-23 40.0 40.0 40.0