condition mean min max ZT0-3 138.48948333333334 87.03945 167.68650000000002 ZT4-7 63.7911 63.7911 63.7911 ZT8-11 50.0149 50.0149 50.0149 ZT12-15 73.405675 62.918400000000005 83.89295 ZT16-19 105.896 105.896 105.896 ZT20-23 174.9515 174.9515 174.9515