condition mean min max ZT0-3 54.95 54.95 54.95 ZT4-7 3.8 3.8 3.8 ZT8-11 41.35 41.35 41.35 ZT12-15 22.35 22.35 22.35 ZT16-19 48.25 48.25 48.25 ZT20-23 7.25 7.25 7.25