WETHERSFIELD — While positive and negative state job growth over the past several months might curtail attempts to identify a predictable trend, the latest gain of 3,400 positions in September — along with a drop in the unemployment rate — is “good news,” according to Andy Condon, director of the state Department of Labor’s Office of Research. His optimism was grounded in caution, however. “While we hope to build on September’s job gains, we don’t yet see that pattern emerging in the Connecticut labor market,” Condon said. There was an even split among the  state’s ten major industry sectors, with half showing job gains. Those included government, leisure and hospitality, private education and health services, financial activities, and other services. Of the sectors posting employment declines, the construction sector showed the greatest number of job losses, with 1,600.  The unemployment rate in Connecticut fell to 8.9 percent, compared to 9 percent in August and a national September rate of 9.1 percent.