condition mean min max ZT0-3 11.4849025 10.588805 12.381 ZT4-7 9.0989 9.0989 9.0989 ZT8-11 81.72755000000001 81.72755000000001 81.72755000000001 ZT12-15 0 0 0 ZT16-19 27.91565 27.91565 27.91565 ZT20-23 15.37185 15.37185 15.37185