TABLE 1.

Sample Characteristics (n = 74)

Characteristic	Total n = 74	Caregivers n = 42	Noncaregivers n = 32
Age (years), mean ± SD	68.4 ± 13.9	70.1 ± 13.6	66.1 ± 14.1
White/African American	59 (79.7%)/15 (20.3%)	34 (80.9%)/8 (19.1%)	25 (78.1%)/7 (21.9%)
Symptoms of depression, mean ± SD*	9.5 ± 8.3	11.7 ± 8.8	6.5 ± 6.5
Sleep quality, mean ± SD**	5.8 ± 3.7	6.6 ± 3.8	5.1 ± 3.6
MAOA-uVNTR frequencies
3 Repeat	24 (32.4%)	16 (38.1%)	8 (25.0%)
3.5 Repeat	2 (2.7%)	1 (2.4%)	1 (3.1%)
4 Repeat	48 (64.9%)	25 (59.5%)	23 (71.9%)

Mean and SD values are unadjusted for age and race.

SD = standard deviation; MAOA-uVNTR = variable number of tandem repeats in the monoamine oxidase-A linked polymorphic region.

^*p < .05

^**p < .10 in analyses comparing caregivers versus controls.