condition mean min max ZT0-3 0.06557550000000001 0.043626 0.087525 ZT4-7 0.0430707 0.0430707 0.0430707 ZT8-11 0.0432193 0.0432193 0.0432193 ZT12-15 0 0 0 ZT16-19 0.04307345 0.04307345 0.04307345 ZT20-23 0.0 0.0 0.0