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Table 2 Summary of findings (SoF) table using GRADE methodology

From: Low-molecular-weight heparins are superior to vitamin K antagonists for the long term treatment of venous thromboembolism in patients with cancer: a cochrane systematic review

LMWH compared to VKA for patients with cancer requiring long term anticoagulation for VTE

Patient or population: patients with cancer requiring long term anticoagulation for VTE

Settings: Outpatient

Intervention: LMWH

Comparison: VKA

Outcomes

Illustrative comparative

risks* (95% CI)

Relative

effect

(95% CI)

No of

Participants

(studies)

Quality of

the evidence

(GRADE)

Comments

 

Assumed risk

Corresponding risk

    
 

VKA

LMWH

    

Mortality (follow-up: 3–6 months)

Population

RR 0.95 (0.81 to 1.11)

1346 (4)

OO low1,2

 
 

310 per 1000

294 per 1000 (251 to 344)

    
 

Low risk population

    
 

30 per 1000

28 per 1000 (24 to 33)

    
 

High risk population

    
 

1000 per 1000

950 per 1000 (810 to 1110)

    

Recurrent VTE (binary) (follow-up: 3–12 months)

Population

RR 0.51 (0.35 to 0.74)

1109 (4)

O moderate2

 
 

139 per 1000

71 per 1000 (49 to 103)

    
 

Low risk population

    
 

40 per 1000

20 per 1000 (14 to 30)

    
 

High risk population

    
 

160 per 1000

82 per 1000 (56 to 118)

    

Major bleeding (follow-up: 3–6 months)

Low risk population

RR 1.05 (0.53 to 2.1)

1120 (4)

OO low2,3

 
 

30 per 1000

31 per 1000 (16 to 63)

    
 

High risk population

    
 

160 per 1000

168 per 1000 (85 to 336)

    

Minor bleeding (follow-up: 3–6 months)

Low risk population

RR 0.85 (0.53 to 1.35)

1120 (4)

OOO very low2,4

 
 

120 per 1000

102 per 1000 (64 to 162)

    
 

High risk population

    
 

500 per 1000

425 per 1000 (265 to 675)

    
  1. *The basis for the assumed risk (e.g. the median control group risk across studies) is provided in footnotes. The corresponding risk (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).
  2. CI: confidence interval; LMWH: low-molecular-weight heparin; RR: Risk ratio; VKA: vitamin K antagonists; VTE: venous thromboembolism
  3. GRADE Working Group grades of evidence
  4. High quality: Further research is very unlikely to change our confidence in the estimate of effect.
  5. Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate.
  6. Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate.
  7. Very low quality: We are very uncertain about the estimate.
  8. 1 RR = 0.95 and 95% CI = 0.81–1.11
  9. 2 We could not obtain data for subgroups of patients with cancer in 11 RCTs
  10. 3 RR = 1.05; 95% CI = 0.53–2.10
  11. 4 Inconsistency was severe (I2 = 65%)