Table 3.

Characteristics of measures that conceptualized perceived fatigue in the context of activity.

Measure characteristic	N	%
Assessment method
Performance-based	14	82.4
Self-report	3	17.6
Number of fatigue items
Single item	12	70.6
Multiple items	5	29.4
Activity type
Walking test	9	52.9
Physical task	4	23.5
Cognitive task	2	11.8
Physical and cognitive tasks	2	11.8
Fatigability output
Scoring
Ratio of fatigue score to activity level	4	23.5
Fatigue score	13	76.5
Level of measurement
Ratio	6	35.3
Interval	4	23.5
Ordinal	2	11.8
Nominal	5	29.4
Reliability/validity reported
Yes	6	35.3
No	11	64.7