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 0.187615231 0.0 0.375230462 ZT16-19 0.09080777416666667 0.0 0.18161554833333335 ZT20-23 0.0104716585 0.0 0.020943317