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 0.03321725 0.0 0.0664345 ZT16-19 0.0580535 0.0580535 0.0580535 ZT20-23 0.0 0.0 0.0