condition mean min max ZT0-3 0.969982 0.969982 0.969982 ZT4-7 0.99583 0.99583 0.99583 ZT8-11 1.4212250000000002 1.4212250000000002 1.4212250000000002 ZT12-15 1.09808 1.09808 1.09808 ZT16-19 1.83213 1.83213 1.83213 ZT20-23 1.40334 1.40334 1.40334