Figure 3.

Funnel plot. Funnel plot of the 32 estimates of β against their precision (1/SE). The dotted vertical line indicates the meta-analysis estimate. Estimates based on data originally presented as FEV1%P are distinguished from other estimates by different symbols.

Fry et al. BMC Cancer 2012 12:498   doi:10.1186/1471-2407-12-498
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