|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†:|
|Drospirenone||17||26||3.2 (1.5 to 7.0)||3.3 (1.4 to 7.6)|
|Complete case analysis‡:|
|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.