Gold standard
		Systematic review	Not systematic review
Searches with methodological filters	Detected by the filter	a	b
	Not detected by the filter	c	d
Sensitivity = a / (a + c) Specificity = d / (b + d) Precision = a / (a + b) Accuracy = (a + d) / (a + b + c + c) Number needed to read = 1 / precision = (a + b) / a Systematic reviews in the gold standard = a + c Non‐systematic reviews in the gold standard = b + d