condition mean min max ZT0-3 0.77834 0.0 1.55668 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 0.12830816666666667 0.0 0.25661633333333334 ZT20-23 0 0 0