condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.061365069 0.0 0.122730138 ZT16-19 0.106112389 0.0 0.212224778 ZT20-23 0.0 0.0 0.0