condition mean min max ZT0-3 2260.8450000000003 2260.8450000000003 2260.8450000000003 ZT4-7 2158.09 2158.09 2158.09 ZT8-11 1901.4650000000001 1901.4650000000001 1901.4650000000001 ZT12-15 1576.255 1576.255 1576.255 ZT16-19 1484.635 1484.635 1484.635 ZT20-23 2040.7549999999999 2040.7549999999999 2040.7549999999999