condition mean min max ZT0-3 0.698511709 0.0 1.397023418 ZT4-7 4.0475806815 3.2673745825 4.8277867805 ZT8-11 9.87926665725 7.3100819845 12.448451330000001 ZT12-15 10.98468085675 9.65543675 12.3139249635 ZT16-19 5.43438435225 5.094952077 5.7738166275000005 ZT20-23 6.224879674249999 6.155672762 6.2940865865