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 0.043418882 0.022833514 0.06400425 ZT16-19 0.012268844 0.0 0.024537688 ZT20-23 0.01041326775 0.0 0.0208265355