condition mean min max ZT0-3 41.25 41.25 41.25 ZT4-7 2.5 2.5 2.5 ZT8-11 37.95 37.95 37.95 ZT12-15 21.95 21.95 21.95 ZT16-19 22.85 22.85 22.85 ZT20-23 43.7 43.7 43.7