condition mean min max ZT0-3 4.98987669175 3.5552123154999995 6.424541068 ZT4-7 9.89348120675 6.4134860785 13.373476335 ZT8-11 17.8862135925 15.112156315 20.660270869999998 ZT12-15 20.7102680825 19.889680300000002 21.530855865 ZT16-19 14.210202634999998 14.09557506 14.324830209999998 ZT20-23 15.65739832 14.900013775000001 16.414782865