condition mean min max ZT0-3 0.024396166666666667 0.0 0.0731885 ZT4-7 0.073807 0.073807 0.073807 ZT8-11 0.3491845 0.3491845 0.3491845 ZT12-15 0.358891275 0.29160105000000003 0.4261815 ZT16-19 0.2128305 0.2128305 0.2128305 ZT20-23 0.3105245 0.3105245 0.3105245