condition mean min max ZT0-3 0.7941092815 0.6455321110000001 0.942686452 ZT4-7 0.5088080534999999 0.4368651653333333 0.5807509416666666 ZT8-11 0.7666467 0.7480759456666667 0.7852174543333333 ZT12-15 0.9182910565 0.8565232349999999 0.9800588779999999 ZT16-19 1.0186778795 0.9504620939999999 1.086893665 ZT20-23 1.0326521876666666 0.851911098 1.2133932773333331