condition mean min max ZT0-3 12.0 12.0 12.0 ZT4-7 12.8 12.8 12.8 ZT8-11 49.85 49.85 49.85 ZT12-15 13.2 13.2 13.2 ZT16-19 12.25 12.25 12.25 ZT20-23 38.05 38.05 38.05