condition mean min max ZT0-3 25.65 25.65 25.65 ZT4-7 23.9 23.9 23.9 ZT8-11 50.45 50.45 50.45 ZT12-15 66.85 66.85 66.85 ZT16-19 27.55 27.55 27.55 ZT20-23 36.0 36.0 36.0