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 0.050851948 0.0 0.101703896 ZT20-23 0.010939149166666667 0.0 0.021878298333333334