condition mean min max ZT0-3 0.078784 0.0 0.157568 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 0.0699165 0.0 0.139833 ZT20-23 0 0 0