condition mean min max ZT0-3 0.088487356 0.0 0.176974712 ZT4-7 0.0 0.0 0.0 ZT8-11 0.09548330133333333 0.0 0.19096660266666665 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.16991283599999998 0.0 0.33982567199999997