condition mean min max ZT0-3 20.95 20.95 20.95 ZT4-7 22.9 22.9 22.9 ZT8-11 18.4 18.4 18.4 ZT12-15 46.95 46.95 46.95 ZT16-19 47.45 47.45 47.45 ZT20-23 26.3 26.3 26.3