condition mean min max ZT0-3 50.477075 46.282399999999996 54.67175 ZT4-7 24.91235 24.91235 24.91235 ZT8-11 22.392200000000003 22.392200000000003 22.392200000000003 ZT12-15 0 0 0 ZT16-19 20.1916 20.1916 20.1916 ZT20-23 22.97555 22.97555 22.97555