condition mean min max ZT0-3 12.85 12.85 12.85 ZT4-7 3.2 3.2 3.2 ZT8-11 12.35 12.35 12.35 ZT12-15 3.05 3.05 3.05 ZT16-19 13.85 13.85 13.85 ZT20-23 11.55 11.55 11.55