Table 4.

RPQ Total Score and Number of Symptoms Endorsed by Time and TBI Severity Subgroup

	Mild TBI	Moderate/severe TBI
2 weeks
n	1593	128
Total score
Mean (SD)	18.4 (14.9)	18.4 (13.0)
Median (IQR)	15 (6, 28)	16 (7, 28)
No. endorsed
Mean (SD)	6.8 (4.8)	7.0 (4.3)
Median (IQR)	6 (3, 11)	7 (3, 10)
3 months
n	1480	208
Total score
Mean (SD)	14.2 (14.8)	13.6 (12.8)
Median (IQR)	9 (2, 24)	11 (2, 22.75)
No. endorsed
Mean (SD)	5.3 (4.9)	5.2 (4.5)
Median (IQR)	4 (1, 9)	5 (1, 9)
6 months
n	1397	203
Total score
Mean (SD)	12.9 (14.6)	13.0 (12.7)
Median (IQR)	8 (0, 20.50)	9 (3, 21)
No. endorsed
Mean (SD)	4.9 (4.9)	4.9 (4.4)
Median (IQR)	3 (0, 8)	4 (1, 9)
12 months
n	1292	196
Total score
Mean (SD)	12.2 (14.2)	14.4 (12.9)
Median (IQR)	6 (0, 20)	11 (3.25, 22)
No. endorsed
Mean (SD)	4.6 (4.8)	5.5 (4.3)
Median (IQR)	3 (0, 8)	5 (1.25, 9)

RPQ, Rivermead Post-Concussion Symptoms Questionnaire; TBI, traumatic brain injury; SD, standard deviation; IQR, interquartile range.