condition mean min max ZT0-3 1715.924364 1715.924364 1715.924364 ZT4-7 1117.8865289999999 1117.8865289999999 1117.8865289999999 ZT8-11 1376.7442145 1376.7442145 1376.7442145 ZT12-15 1298.709969 1298.709969 1298.709969 ZT16-19 1891.9015279999999 1891.9015279999999 1891.9015279999999 ZT20-23 1624.156129 1624.156129 1624.156129