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Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Words match anywhere in the field.

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Intervention or exposure

Comparison

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Review versions

1,554 questions in 140 reviews · Heart

current versions

No studies 272 · 17.5%Ungraded 44 · 2.8%Very low 329 · 21.2%Low 464 · 29.9%Moderate 319 · 20.5%High 126 · 8.1%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

Question	Effect	Evidence	Status / GRADE
Factor Xa inhibitors vs Anticoagulants Minor bleeding at 30 days ‐ UFH · Anticoagulants in ACS Factor Xa inhibitors for acute coronary syndromes (2011) · Cochrane	RR 1.76 [0.52, 5.94]	1 study · 326 participants	Moderate
Factor Xa inhibitors vs Anticoagulants Minor bleeding at 30 days ‐ Enoxaparin · Anticoagulants in ACS Factor Xa inhibitors for acute coronary syndromes (2011) · Cochrane	RR 0.34 [0.28, 0.43]	1 study · 20078 participants	High
Intervention NR Wang 2006 Chuanxiong preparations for preventing stroke (2010) · Cochrane	no estimate extracted	0 participants	Ungraded
Intervention NR Zhou 1999 Chuanxiong preparations for preventing stroke (2010) · Cochrane	no estimate extracted	2 participants	Ungraded