TABLE 5.

Psychometric Properties of the University of Wisconsin Running Injury and Recovery Index^*

	Step 4: Preliminary Evaluation	Step 5: Reliability Assessment	Step 6: Psychometric Assessment
Item analysis†	r = 0.36–0.81	r = 0.47–0.82	r = 0.43–0.71
Internal consistency	α = .75 (.28, .93)	α = .83 (.76, .89)	α = .82 (.80, .84)
Factor 1	α = .81 (.71, .93)	α = .88 (.81, .94)	α = .89 (.87, .91)
Factor 2	α = .72 (.56, .88)	α = .74 (.62, .85)	α = .78 (.74, .80)
Reproducibility
ICC (agreement)	0.56 (0.16, 0.81)	0.93 (0.89, 0.96)	NA
SEM (agreement)	4.46	1.47	NA
Construct validity
UWRI change – GROC	r = 0.75 (0.39, 0.91)	NA	r = 0.61 (0.4, 0.76)
Responsiveness
UWRI: significant improvement‡	13.33 ± 4.93	NA	9.38 ± 5.78
UWRI: slight improvement‡	10.42 ± 10.31	NA	4.5 ± 7.55
Ceiling effect§	UWRI, 0%; LEFS, 25%	UWRI, 0%	UWRI, 0.22%; LEFS, 12.43%
Floor effect§	UWRI, 3.45%; LEFS, 0%	UWRI, 0%	UWRI, 0%: LEFS, 0%

Abbreviations: GROC, global rating of change; ICC, intraclass correlation coefficient; LEFS, Lower Extremity Functional Scale; NA, not available; SEM, standard error of measurement; UWRI, University of Wisconsin Running Injury and Recovery Index.

^*Values in parentheses are 95% confidence interval.

^†Range of item response (total score).

^‡Values are mean ± SD. Significant improvement, GROC of +4 or +5; slight improvement, GROC of +2 or +3.

^§Ceiling and floor effects are calculated as the percent of respondents achieving the maximum and minimum composite scores, respectively.