Table 6.

Spearman Correlations between RPQ Interval Scores, Injury Factors, Comorbidity and Quality of Life for TBI (n = 109), and Orthopedic (n = 114) Participants

Variables	RPQ interval scores
	TBI	Orthopedic
Age	-0.22*	-0.30**
Time since injury (years)	0.06	-0.13
Length of hospital stay	0.15	0.40**
ISS	-0.07	0.39**
GCSa	-0.17	-0.30
Pre-injury total comorbidityb	0.06	0.06
Prior musculoskeletalb	0.05	0.17
Prior neurologicalb	0.20*	0.15
Prior psychologicalb	0.25*	0.18*
Post-injury total comorbidityb	0.27**	0.28**
Post-injury musculoskeletalb	0.29**	0.24**
Post-injury neurologicalb	0.33**	0.34**
Post-injury psychologicalb	0.40**	0.39**
WHOQoL-BREF total interval scorec	-0.68**	-0.47**
Physical domainc	-0.58**	-0.47**
Psychological domainc	-0.67**	-0.39**
Social domainc	-0.32**	-0.29**
Environmental domainc	-0.65**	-0.40**

^*Significance at p < 0.05; ^**significance at p < 0.001.

^aGCS scores, which were only available for 69% of TBI and 17% of orthopedic participants; ^bordinal-level comorbidity scores on the Cumulative Illness Rating Scale; ^ctotal interval and domain-level scores for the 24-item WHOQoL-BREF excluding global items 1 and 2.

GCS, Glasgow Coma Scale; ISS, Injury Severity Score; RPQ, Rivermead Post-Concussion Symptoms Questionnaire; WHOQoL-BREF, World Health Organization Quality of Life Brief Version.