| WHO | clinicaltrials.gov | ISRCTN | |
| flight AND stockings | 0 | 0 | 0 |
| travel AND stockings | 0 | 0 | 1 |
| flight AND tights | 0 | 0 | 0 |
| travel AND tights | 0 | 2 | 0 |
| flight AND oedema | 2 | 0 | 0 |
| flights AND edema | 2 | 0 | 0 |
| air AND travel AND thrombosis | 1 | 0 | 0 |
| air AND travel AND thromboembolism | 2 | 0 | 0 |
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