Funnel graph for the assessment of potential publication bias in FNAB. The funnel graph plots the log of the DOR against the SE of the log of the DOR (an indicator of sample size). Forty-six circle represents forty-six studies in the meta-analysis. The line in the centre indicates the summary diagnostic odds ratio.
Yu et al. BMC Cancer 2012 12:41 doi:10.1186/1471-2407-12-41