condition mean min max ZT0-3 0.025396514499999998 0.0 0.050793028999999996 ZT4-7 0.04760251466666667 0.0 0.09520502933333334 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0220136085 0.0 0.044027217 ZT20-23 0.0 0.0 0.0