condition mean min max ZT0-3 0.054398 0.0 0.0819425 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0382245 0.0 0.076449 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0