condition mean min max ZT0-3 47.56611 47.56611 47.56611 ZT4-7 42.026548000000005 42.026548000000005 42.026548000000005 ZT8-11 39.502812 39.502812 39.502812 ZT12-15 34.889295 34.889295 34.889295 ZT16-19 25.864555 25.864555 25.864555 ZT20-23 26.495807499999998 26.495807499999998 26.495807499999998