condition mean min max ZT0-3 34.65 34.65 34.65 ZT4-7 4.7 4.7 4.7 ZT8-11 17.35 17.35 17.35 ZT12-15 32.0 32.0 32.0 ZT16-19 41.95 41.95 41.95 ZT20-23 18.799999999999997 18.799999999999997 18.799999999999997