condition mean min max ZT0-3 0.08927 0.0 0.17854 ZT4-7 0.0 0.0 0.0 ZT8-11 0.181987 0.181987 0.181987 ZT12-15 0 0 0 ZT16-19 0.3518635 0.3518635 0.3518635 ZT20-23 0.353636 0.353636 0.353636