condition mean min max ZT0-3 0.0540495 0.0 0.1621485 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.323481 0.323481 0.323481 ZT20-23 0.1758795 0.1758795 0.1758795