condition mean min max ZT0-3 0.090641 0.0604815 0.1208005 ZT4-7 0.061626 0.061626 0.061626 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.1191335 0.1191335 0.1191335