condition mean min max ZT0-3 4.8936425 4.1867 5.600585000000001 ZT4-7 2.090635 2.090635 2.090635 ZT8-11 2.5941650000000003 2.5941650000000003 2.5941650000000003 ZT12-15 0 0 0 ZT16-19 4.6945 4.6945 4.6945 ZT20-23 3.87297 3.87297 3.87297