Table 4.

Levels of evidence for the overall adequacy of a measurement property adapted from [28]

Level	Rating	Criteria
Strong	+++, ? (strong) or −−−	Consistent findings in multiple studies of good methodological quality OR in one study of excellent methodological quality
Moderate	++, ? (moderate) or −−	Consistent findings in multiple studies of fair methodological quality OR in one study of good methodological quality
Limited	+, ? (limited) or −	One study of fair methodological quality
Conflicting	+/−	Conflicting findings
Unknown	?	Only studies of poor methodological quality

+ positive rating, ? indeterminate rating, − negative rating