condition mean min max ZT0-3 5.3 5.3 5.3 ZT4-7 12.8 12.8 12.8 ZT8-11 27.049999999999997 27.049999999999997 27.049999999999997 ZT12-15 45.95 45.95 45.95 ZT16-19 19.5 19.5 19.5 ZT20-23 29.35 29.35 29.35