condition mean min max ZT0-3 5.0 5.0 5.0 ZT4-7 3.2 3.2 3.2 ZT8-11 5.5 5.5 5.5 ZT12-15 36.45 36.45 36.45 ZT16-19 25.1 25.1 25.1 ZT20-23 9.8 9.8 9.8