condition mean min max ZT0-3 0.299162 0.0 0.897486 ZT4-7 0.268788 0.268788 0.268788 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0