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 0.0 0.0 0.0 ZT16-19 0.007187691833333332 0.0 0.014375383666666665 ZT20-23 0.0108263915 0.0 0.021652783