condition mean min max ZT0-3 28.799999999999997 28.799999999999997 28.799999999999997 ZT4-7 39.1 39.1 39.1 ZT8-11 48.5 48.5 48.5 ZT12-15 34.1 34.1 34.1 ZT16-19 47.75 47.75 47.75 ZT20-23 67.65 67.65 67.65