condition mean min max ZT0-3 6.30075668838611 1.9500950644405 9.848700000717828 ZT4-7 0.0344328 0.0344328 0.0344328 ZT8-11 3.1262800000000004 3.1262800000000004 3.1262800000000004 ZT12-15 1.59311612 0.020517590000000002 3.16571465 ZT16-19 7.413774999999999 7.413774999999999 7.413774999999999 ZT20-23 5.779014999999999 5.779014999999999 5.779014999999999