condition mean min max ZT0-3 0.48890525 0.372584 0.6052265 ZT4-7 0.096615 0.096615 0.096615 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.374583 0.374583 0.374583 ZT20-23 0.264837 0.264837 0.264837