condition mean min max ZT0-3 40.25 40.25 40.25 ZT4-7 33.3 33.3 33.3 ZT8-11 46.85 46.85 46.85 ZT12-15 27.25 27.25 27.25 ZT16-19 28.45 28.45 28.45 ZT20-23 48.6 48.6 48.6