Table 2. Participant characteristics by sample and region in 2013 (most recent follow-up).

	Midwest			Southeast
	S1	S2	S3	S4	S5	Total
Gender
Male	85.4	89.1	73.6	54.1	74.8	71.9
Female	14.6	10.9	26.4	45.9	24.2	28.1
Race
White	100.0	96.4	96.7	61.9	77.9	79.1
Black	0.0	1.8	2.2	34.8	19.5	18.6
Other	0.0	1.8	1.1	3.3	2.6	2.3
Injury severity
C1-C4, Non-A	18.8	14.6	11.0	7.7	6.8	8.9
C5-C8, Non-A	37.5	41.8	35.2	29.3	22.8	28.1
Non-C, Non-A	33.3	23.6	37.4	44.8	35.9	37.1
Ambulatory	10.4	20.0	16.5	18.2	34.6	25.9
Age at survey	64.9 (5.0)	59.3 (8.2)	56.1 (10.1)	54.2 (11.5)	52.0 (12.5)	54.3 (11.9)
Years post injury	45.9 (4.1)	36.1 (5.4)	29.8 (7.2)	26.5 (5.8)	22.9 (9.9)	27.0 (10.2)

Note: Values given as % or mean (SD). Non-A = nonambulatory; S = sample.