condition mean min max ZT0-3 4.05 4.05 4.05 ZT4-7 5.1 5.1 5.1 ZT8-11 4.45 4.45 4.45 ZT12-15 4.8 4.8 4.8 ZT16-19 13.55 13.55 13.55 ZT20-23 12.85 12.85 12.85