condition mean min max ZT0-3 54.548505934999994 52.716723259999995 56.38028861 ZT4-7 54.151568018333336 53.62921980666667 54.67391623 ZT8-11 60.77376101833333 58.24879560666667 63.298726429999995 ZT12-15 65.03531785499999 64.78596017 65.28467554 ZT16-19 68.23831683166667 65.98091645 70.49571721333334 ZT20-23 68.252016755 67.92264462333334 68.58138888666667