condition mean min max ZT0-3 25.75 25.75 25.75 ZT4-7 3.1 3.1 3.1 ZT8-11 32.05 32.05 32.05 ZT12-15 56.7 56.7 56.7 ZT16-19 38.2 38.2 38.2 ZT20-23 17.55 17.55 17.55