condition mean min max ZT0-3 0.0366674 0.0366674 0.0366674 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03264355 0.03264355 0.03264355 ZT16-19 0.007133 0.007133 0.007133 ZT20-23 0.0071491 0.0071491 0.0071491