condition mean min max ZT0-3 0.874709 0.7331995 1.0162185 ZT4-7 0.298564 0.298564 0.298564 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 1.973135 1.973135 1.973135 ZT20-23 3.62193 3.62193 3.62193