Table 1.

Estimates of the bias, true standard error (SD), model based standard error (SE), coverage probability (CP) and relative efficiency (RE) of common odds ratio estimated from all studies (in log scale) in 5000 simulations based on Sarmanov beta-binomial model and independent beta-binomial model, with different number of studies n, for different within study correlations ρ. (a₁, b₁, a₂, b₂) = (0.5, 0.5, 0.5, 0.5).

		Sarmanov model					Independent model
n	ρ	Bias	SD	SE	CP (%)	RE	Bias	SD	SE	CP (%)	RE
20	0	−0.005	0.439	0.415	92.6	1.000	−0.005	0.438	0.416	93.4	0.995
	0.2	0.003	0.388	0.378	94.4	1.000	0.003	0.395	0.416	96.0	0.826
	0.4	0.003	0.321	0.336	96.8	1.000	0.004	0.352	0.416	97.7	0.652
40	0	−0.001	0.302	0.294	93.8	1.000	−0.001	0.302	0.295	94.4	0.993
	0.2	0.005	0.271	0.268	94.5	1.000	−0.006	0.272	0.295	96.7	0.825
	0.4	0.002	0.228	0.233	96.1	1.000	0.002	0.247	0.295	98.2	0.624
60	0	0.000	0.250	0.240	93.7	1.000	0.000	0.250	0.241	94.0	0.992
	0.2	0.004	0.222	0.219	94.4	1.000	0.004	0.222	0.241	96.7	0.826
	0.4	0.005	0.185	0.188	95.5	1.000	0.006	0.201	0.241	98.1	0.609