. Author manuscript; available in PMC: 2011 Jan 1.

Published in final edited form as: Arch Gerontol Geriatr. 2009 Mar 12;50(1):96–100. doi: 10.1016/j.archger.2009.02.006

Table 1.

Demographic characteristics of the study samples, mean ± S.D., or n(%)

	CDR = 0 Development	CDR = 0 Validation	CDR = 0.5	CDR = 1
Number	287	287	436	189
Women	159 (44.6)	177 (61.7)	241 (55.3)	118 (62.4)
Race
African American	26 (9.1)	26 (9.1)	46 (10.6)	33(17.5)
White	256 (89.5)	258 (89.0)	387 (88.8)	155 (82.0)
Other races	4 (1.4)	3 (1.2)	3 (0.7)	1 (0.5)
Age, years	76.3 ± 8.4	75.8 ± 8.7	76.5 ± 7.3	77.4 ± 7.6
Education, years	14.7 ± 3.0	14.5 ± 3.2	13.8 ± 3.1	12.8 ± 3.3
Total PPT score	26.8 ± 5.0	27.3 ± 5.0	25.7 ± 5.3	23.6 ± 5.8
Functional (PPT > 28)	150 (52.3)	163 (56.8)	189 (43.4)	53 (28.0)
Robust (PPT > 32)	22 (7.7)	33 (11.5)	25 (5.7)	7 (3.7)