***TASK***
the task is to simplify the input abstract of a biomedical literature

***INPUT***
the input is the abstract of a biomedical literature

***OUTPUT***
the output is the simplified abstract for the input abstract of a biomedical literature

***DOCUMENTATION***

***EXAMPLES***

Input: Four trials involving 527 predominantly male participants were included. The main weakness of the studies was the lack of correct stratification of the arthroscopic intervention. The relative risk (RR) of thrombotic events was 0.16 (95% confidence interval (CI); 0.05 to 0.52) comparing any type of low molecular weight heparin (LMWH) versus placebo. All thrombotic events but one (pulmonary embolism in the LMWH group) were distal venous thrombosis. Adverse events were most common in the intervention group than in the control group, RR 2.04 (95% CI 1.21 to 3.44). There were 66 episodes of adverse events. The number needed to harm was 20 for any adverse events. This meta-analysis suggests that LMWH reduces the incidence of distal DVT diagnosed by sonogram. The clinical benefit of this is uncertain. No strong evidence was found to conclude thromboprophylaxis is effective to prevent thromboembolic events and safe, in people with unknown risk factors for thrombosis, undergoing knee arthroscopy.
Output:

This review reports that low molecular weight heparin reduces the incidence of distal DVT diagnosed but the clinical benefits of this are uncertain. The review authors identified four completed studies from three countries that randomly assigned a total of 527 adults to low molecular weight heparin (LMWH) or no intervention or placebo. The mean age of participants ranged from 31 to 44 years and nearly three quarters were male. The relative risk (RR) of thrombotic events was 0.16 (range 0.05 to 0.52). The number needed to treat to prevent one thrombotic event was 17. All the blood clots were distal and were mainly diagnosed by sonogram. Adverse events were most common in the intervention group. The most common complication was minor bleeding with a RR of 2.23 (range 0.99 to 4.99). The number needed to harm was 20. No completed studies were found that looked at mechanical devices such as graduated elastic stockings or intermittent pneumatic compression, for patients immobilized in bed.