condition mean min max ZT0-3 44.0 44.0 44.0 ZT4-7 19.5 19.5 19.5 ZT8-11 26.95 26.95 26.95 ZT12-15 31.75 31.75 31.75 ZT16-19 37.85 37.85 37.85 ZT20-23 27.45 27.45 27.45