Example 1 Table. Analysis of Oral Contraceptive Use, Presence of Factor V Leiden Allele, and Risk for Venous Thromboembolism

Factor V Leiden	Oral Contraceptives	No. of Patients	No. of Controls	Odds Ratio
Yes	Yes	25	2	34.7
Yes	No	10	4	6.9
No	Yes	84	63	3.7
No	No	36	100	1 (Reference)

Table modified from Vandenbroucke et al. [182] by Botto et al. [183].