an increasing trendP < 0.05
The incidence of referred cases and positive phosphine test cases showed an increasing trend ( P < 0.05) from 2006 to 2013 per 1 million of Tehran population (Figure 3 ).
The incidence of referred cases and positive phosphine test cases showed an increasing trend ( P < 0.05) from 2006 to 2013 per 1 million of Tehran population (Figure 3 ).