condition mean min max ZT0-3 66.85 66.85 66.85 ZT4-7 31.4 31.4 31.4 ZT8-11 41.35 41.35 41.35 ZT12-15 46.05 46.05 46.05 ZT16-19 48.05 48.05 48.05 ZT20-23 49.8 49.8 49.8