condition mean min max ZT0-3 2.06119006375 2.0536518815 2.068728246 ZT4-7 1.62264361775 1.1545849975 2.090702238 ZT8-11 2.4347960325 2.413472745 2.45611932 ZT12-15 3.0969927889999997 2.187754404 4.006231174 ZT16-19 3.292017037 2.3296888735000003 4.2543452004999995 ZT20-23 5.05822985675 4.67724629 5.4392134235