Table 1. Comparison of subjects who participated versus those lost to follow up.

Variables	At least one follow-up		Exact P**
	No (N=39)	Yes* (N=103)
Type of injury			0.171
MVA	11(36.7%)	57(57.6%)
Fall	9(30%)	20(20.2%)
Assault	10(33.3%)	21(21.2%)
Other	0	1(1.01%)
Severity			0.069
Mild	30(78.9%)	61(61%)
Moderate & Severe	8(21.1%)	39(39%)
Any axis-I psychiatric diagnosis prior to TBI
No	13(33.3%)	27(26.2%)	0.41
Yes	26(66.7%)	76(73.4%)
Any depression prior to TBI
No	33(84.6%)	85(82.5%)	1.00
Yes	6(15.4%)	18(17.5%)
Substance dependence or abuse prior to TBI
No	22(57.9%)	52(51.5%)	0.569
Yes	16(42.1%)	49(48.5%)
GMHR prior to TBI			0.60
1	0	1(0.98%)
2	3(12%)	6(5.9%)
3	2(8%)	7(6.9%)
4	20(80%)	88(86.3%)

^*At least one follow-up

^**Fisher's exact test