condition mean min max ZT0-3 7.2008500545 5.4553068389999995 8.94639327 ZT4-7 8.4855939 7.780510239500001 9.1906775605 ZT8-11 13.59415505875 11.1465340675 16.04177605 ZT12-15 13.6329283425 13.035273759999999 14.230582925 ZT16-19 8.4540174555 7.912447998499999 8.9955869125 ZT20-23 10.980226623 10.312618835999999 11.64783441