condition mean min max ZT0-3 0.434119488 0.0 0.868238976 ZT4-7 0.252559649 0.192491055 0.31262824300000003 ZT8-11 0.0 0.0 0.0 ZT12-15 0.40804923075 0.35718240100000004 0.4589160605 ZT16-19 0.23595632975000003 0.0 0.47191265950000005 ZT20-23 0.57017904425 0.2367434955 0.903614593