Table 2.

Characteristics of systematic reviews of outcome measurement instruments (n = 100)

Characteristic	Reviews (n)
Construct of interest
Patient-reported outcome	51
Non-patient-reported outcome	29
Patient- and non-patient-reported outcome	20
Level of health of the construct of interest*
Biological and physiological variables	29
Symptom status	56
Physical state	42
Emotional state	19
Cognitive/mental state	13
Functional status	63
Physical functioning	48
Social functioning	22
Cognitive/mental functioning	21
Role functioning	9
General health perceptions	37
Health-related quality of life	36
Self-rated health	3
Overall quality of life	9
Age of the population of interest
Children 0–18	20
Adults 18 +	58
Both	22
Condition of the population of interest*
Circulatory system	11
Congenital and genetic conditions	8
Digestive, endocrine and metabolic system	16
Ear, eye, and respiratory system	14
Genitourinary and reproductive system	9
Infections and parasites	5
Injuries and external causes	13
Mental and behavioral health	19
Musculoskeletal system	30
Neoplasms	15
Nervous system	16
Perinatal and pediatric health	4
Skin and subcutaneous tissue	10
Factors/symptoms influencing health status/contact with health services	42
OMI type included*
Questionnaires	41
Clinical rating scales	41
Performance-based tests	24
Observations	7
Interviews	7
Imaging tests	6
Laboratory tests	6
Diaries	5
Videos	1
Measurement properties considered per review, median [range]*	[1–9]
Content validity	64
Structural validity	46
Internal consistency	69
Cross-cultural validity/measurement invariance	37
Reliability	87
Measurement error	47
Construct validity	82
Criterion validity	50
Responsiveness	62

^*Multiple characteristics could be reported for the same review