condition mean min max ZT0-3 0.7785805140000001 0.57533908 0.9818219480000001 ZT4-7 10.635491374 5.725999948 15.5449828 ZT8-11 14.689171135999999 13.389951362 15.98839091 ZT12-15 3.03446611275 0.234541724 5.834390501500001 ZT16-19 0.27919967199999995 0.23718510450000002 0.32121423949999994 ZT20-23 0.19029370375 0.147728225 0.23285918249999998