condition mean min max ZT0-3 1.56006 1.56006 1.56006 ZT4-7 1.9509249999999998 1.9509249999999998 1.9509249999999998 ZT8-11 2.0082 2.0082 2.0082 ZT12-15 1.99304 1.99304 1.99304 ZT16-19 1.879405 1.879405 1.879405 ZT20-23 1.410025 1.410025 1.410025