condition mean min max ZT0-3 0.15297425 0.0 0.3059485 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0432193 0.0432193 0.0432193 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.086773 0.086773 0.086773