condition mean min max ZT0-3 5.155914748500001 5.025834232 5.285995265 ZT4-7 4.07759210675 3.7936212165 4.361562997 ZT8-11 2.29421012175 2.1787273655 2.409692878 ZT12-15 5.536759141999999 3.0125019745 8.0610163095 ZT16-19 9.90302170475 8.6779555845 11.128087825 ZT20-23 8.91677117675 8.506826861 9.3267154925