. 2009 Dec 11;85(6):862–872. doi: 10.1016/j.ajhg.2009.11.001

Table 3.

Type I Error Rates (×10⁴) at the Nominal Significance Level of 10⁻⁴ for Testing Equal Odds Ratios When Control Samples Are Shared Between Two Case-Control Studies

No. of Cases			Original Data		Summary Results
Study 1	Study 2	No. of Controls	Robust^a	Naive^b	Robust^a	Naive^b
1000	1000	1000	0.95	0.001	1.65	0.001
1000	1000	2000	0.98	0.027	1.36	0.027
1000	1000	3000	0.99	0.091	1.25	0.091
1000	1000	4000	1.00	0.173	1.21	0.173
1500	500	1000	0.92	0.004	1.42	0.004
1500	500	2000	0.93	0.084	1.19	0.084
1500	500	3000	0.93	0.177	1.11	0.177
1500	500	4000	0.94	0.265	1.08	0.265

Robust variance estimator used.

Naive variance estimator used.