condition mean min max ZT0-3 0.04015585 0.0228378 0.06246195 ZT4-7 0.046651750000000006 0.046651750000000006 0.046651750000000006 ZT8-11 0.0 0.0 0.0 ZT12-15 0.06284095 0.0620164 0.0636655 ZT16-19 0.05760285 0.05760285 0.05760285 ZT20-23 0.0394269 0.0394269 0.0394269