condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.3673785 0.3673785 0.3673785 ZT12-15 0.58470625 0.0 1.1694125 ZT16-19 0.0 0.0 0.0 ZT20-23 0.4001185 0.4001185 0.4001185