***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: This study compared the rate of leg ulcer recurrence using two types of compression stockings  and examined the factors underlying Patients with recently healed leg ulceration were entered into a study of leg ulcer recurrence . In all , 188 patients [ 69 % women , mean age = 72 ( SD = 12 ) years ] were entered into the study , of whom 166 were considered suitable for ready-made stockings  and were r and omized to one of two class II below-knee compression stockings and followed for at least 18 months . The remaining patients required either made-to-measure stockings ( 5 ) or could not tolerate stockings owing to friable skin and were treated by other methods ( 17 ) . Overall cumulative recurrence rate was 26 % after 1 year and 31 % at 18 months . Independent risk factors for ( RR = 2.34 , p = 0.021 ) and unsuitability for stockings ( RR = 2.52 , p = 0.013 ) . The r and omized groups had similar stockings , 25 ( 15 % ) could not put their stockings on at all and 43 ( 26 % ) were only able to put them on with great difficulty . The two stocking types differed significantly in this regard when analysed for trend The effect of elastic compression on venous flow in the legs provided by carefully fitted stockings has been measured by a venographic technic . The stocking used provides a gradually decreasing compression from ankle to groin . Clearance of stagnant blood from behind venous valves is clearly improved and the differences observed are statistically highly significant . These data suggest that the routine use of carefully fitted compression stockings will result in a decreased incidence of  deep vein thrombosis ( DVT )  and provide a singularly safe , convenient , and noninvasive method of prophylaxis . Evidence presented suggests that at least two investigators have failed to show a decreased incidence of DVT in limbs subjected to elastic compression because the method of compression was inadequate 
    Output:
    
Both trials reported that not wearing compression hosiery was strongly associated with ulcer recurrence and this is circumstantial evidence that compression reduces ulcer recurrence .
This is circumstantial evidence of the benefit of compression in reducing recurrence .
Recurrence rates may be lower in high compression hosiery than in medium compression hosiery and therefore patients should be offered the strongest compression with which they can comply .