condition mean min max ZT0-3 10.85 10.85 10.85 ZT4-7 3.1 3.1 3.1 ZT8-11 13.1 13.1 13.1 ZT12-15 13.75 13.75 13.75 ZT16-19 26.7 26.7 26.7 ZT20-23 12.5 12.5 12.5