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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Biol Psychol. 2008 Jul 1;79(2):250–255. doi: 10.1016/j.biopsycho.2008.06.004

Table 1.

Sample Characteristics (n = 74)

Characteristic Total Caregivers Non-Caregivers
N=74 n=42 n =32
Age, mean (years) (SD) 68.4 (13.9) 70.1 (13.6) 66.1 (14.1)
Race
  Caucasian 59 (79.7%) 34 (80.9%) 25 (78.1%)
  African American 15 (20.3%) 8 (19.1%) 7 (21.9%)
Cortisol, mean (SD)
  Overnight 85.4 (39.4) 88.4 (45.0) 81.5 (30.8)
  Day 95.7 (49.8) 92.0 (52.7) 100.5 (46.0)
  Evening 67.0 (30.7) 68.6 (32.3) 64.9 (28.8)
MAOA-uVNTR Frequencies*
  3 Repeat (less active) 24 (32.4%) 16 (38.1%) 8 (25.0%)
  3.5 / 4 Repeat (more active) 50 (67.6%) 26 (61.9%) 24 (75.0%)

Note: Cortisol values are in units of nanograms per milligram (ng/mg) creatinine.

*

None of the individuals within the present sample were found to have the less frequently occurring alleles (i.e., 2, 5, and 6).