condition mean min max ZT0-3 44.75 44.75 44.75 ZT4-7 13.6 13.6 13.6 ZT8-11 37.25 37.25 37.25 ZT12-15 66.35 66.35 66.35 ZT16-19 46.85 46.85 46.85 ZT20-23 74.5 74.5 74.5