condition mean min max ZT0-3 5.1 5.1 5.1 ZT4-7 12.6 12.6 12.6 ZT8-11 3.65 3.65 3.65 ZT12-15 11.55 11.55 11.55 ZT16-19 3.3 3.3 3.3 ZT20-23 4.8 4.8 4.8