condition mean min max ZT0-3 0.02686535 0.02686535 0.02686535 ZT4-7 0.03739045 0.03739045 0.03739045 ZT8-11 0.0302937 0.0302937 0.0302937 ZT12-15 0.03699815 0.03699815 0.03699815 ZT16-19 0.03280565 0.03280565 0.03280565 ZT20-23 0.04833125 0.04833125 0.04833125