Fig. 1.

Study cohort selection. * Specific time point follow-up rates were calculated using the following formula:

$\frac{\#\mathit{\text{participants}}\mathit{\text{completing}}\mathit{\text{specified}}\mathit{\text{survey}}}{\#\mathit{\text{participants}}\mathit{\text{completing}}\mathit{\text{specified}}\mathit{\text{survey}}+\#\mathit{\text{participants}}\mathit{\text{passed}}\mathit{\text{through}}\mathit{\text{window}}\mathit{\text{without}}\mathit{\text{completing}}\mathit{\text{survey}}}$

**Any follow-up was calculated using the following formula:

$\frac{\#\mathit{\text{participants}}\mathit{\text{completing}}\mathit{\text{any}}\mathit{\text{survey}}}{\#\mathit{\text{participants}}\mathit{\text{completing}}\mathit{\text{any}}\mathit{\text{survey}}+\#\mathit{\text{participants}}\mathit{\text{passed}}\mathit{\text{through}}6\mathit{\text{month}}\mathit{\text{window}}\mathit{\text{without}}\mathit{\text{completing}}\mathit{\text{survey}}}$

PEPPER, Comparative Effectiveness of Pulmonary Embolism Prevention After Hip and Knee Replacement.