condition mean min max ZT0-3 0.03950845 0.03950845 0.03950845 ZT4-7 0.0153124 0.0153124 0.0153124 ZT8-11 0.03349025 0.03349025 0.03349025 ZT12-15 0.081335 0.081335 0.081335 ZT16-19 0.0270794 0.0270794 0.0270794 ZT20-23 0.036889599999999995 0.036889599999999995 0.036889599999999995