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 0.02178830666666667 0.0 0.04357661333333334 ZT20-23 0.0907125955 0.0 0.181425191