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 0.06844880833333333 0.05314095 0.08375666666666666 ZT16-19 0.02296765 0.0 0.0459353 ZT20-23 0 0 0