Table 2.

 Current use of oral contraceptives and venous thromboembolism

Progestogen in oral contraceptive	Cases (n=61)	Controls (n=215)	Unadjusted matched odds ratio (95% CI)	Adjusted matched odds ratio (95% CI)*
Multiple imputation analysis†:
Levonorgestrel	44	189	1.0	1.0
Drospirenone	17	26	3.2 (1.5 to 7.0)	3.3 (1.4 to 7.6)
Complete case analysis‡:
Levonorgestrel	42	154	–	1.0
Drospirenone	15	22	–	2.9 (1.1 to 7.4)

*Adjusted for body mass index as continuous variable.

†Missing values for body mass index and smoking are imputed.

‡Effect of multiple imputation is illustrated by presentation of complete case analysis adjusted for body mass index; cases and controls with missing body mass index are excluded from complete case analysis, as are controls of excluded cases.