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Table 2 The I/M ratios from the three cancer registries in Guangzhou, Zhongshan, and Sihui in Guangdong Province, China in 2004–2008

From: Estimation of cancer burden in Guangdong Province, China in 2009

Variable Mean Standard deviation 95% confidence interval
Sex
 Male 2.027 0.087 1.856–2.199
 Female 2.864 0.088 2.691–3.038
City
 Guangzhou 3.658 0.102 3.457–3.859
 Zhongshan 2.153 0.101 1.953–2.352
 Sihui 1.527 0.118 1.294–1.759
Average 2.446 0.062 2.324–2.568