condition mean min max ZT0-3 0.0242675 0.0 0.0728025 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.01892435 0.0 0.0378487 ZT16-19 0.0337286 0.0337286 0.0337286 ZT20-23 0.03803265 0.03803265 0.03803265