condition mean min max ZT0-3 12.6 12.6 12.6 ZT4-7 1.1 1.1 1.1 ZT8-11 20.35 20.35 20.35 ZT12-15 20.85 20.85 20.85 ZT16-19 26.15 26.15 26.15 ZT20-23 25.65 25.65 25.65