condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.064160075 0.04723815 0.081082 ZT16-19 0.013500966666666668 0.0 0.027001933333333335 ZT20-23 0 0 0