condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.018272771 0.0 0.036545542 ZT12-15 0.0 0.0 0.0 ZT16-19 0.031789413333333336 0.0 0.06357882666666667 ZT20-23 0.0 0.0 0.0