Table 1.

Definitions.

	DEFINITION	TYPE
P = 1 P = 0	Study is published Study is not published	Observed
S = 1 S = 0	Study is successful (ie, suggests that new method is better) Study is not successful	Observed, potentially subject to interpretation problems
B = 1 B = 0	New method is truly better New method is not truly better	Unobserved, what everyone want to know
M = 1 M = 0	New method makes sense New method does not make sense	Unobserved, varies in time, subjective
D = 1 D = 0	Study is well-designed Study is not well-designed	Unobserved, varies in time, subjective