condition mean min max ZT0-3 0.089515 0.0 0.1723785 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0488875 0.0 0.097775 ZT16-19 0.0 0.0 0.0 ZT20-23 0.1858185 0.1858185 0.1858185