condition mean min max ZT0-3 61.572849345 57.04529456 66.10040413 ZT4-7 33.10616185 27.54553941 38.666784289999995 ZT8-11 23.166799325 23.10827513 23.22532352 ZT12-15 12.1067830995 7.616622015 16.596944183999998 ZT16-19 9.266001990500001 7.595262010499999 10.936741970500002 ZT20-23 13.2187347275 13.141420985 13.296048469999999