Table 4 Levels of evidence for the quality of the measurement property for COSMIN

Strong

+++ or —

Consistent findings in multiple studies of adequate methodological quality OR in one study of very good methodological quality.

Moderate

++ or –

Consistent findings in multiple studies of doubtful methodological quality OR in one study of adequate methodological quality.

Limited

+ or -

One study of inadequate methodological quality.

Conflicting

+/−

Conflicting findings.

Unknown

?

Only studies of inadequate/doubtful methodological quality.