Table 1.

Baseline characteristics of sample by number of comorbid conditions: N = 1751.

CHARACTERISTICS	NO. OF COMORBID CONDITIONS				TOTAL SAMPLE
CHARACTERISTICS	NONE (N = 88)	1–3 (N = 662)	4–6 (N =605)	≥ 7 (N =396)	TOTAL SAMPLE
Mean age, y	74.2^*	76.2^*	78.2^*	79.4^*	77.5
Female sex, %	47.7^*	52.1^*	60.5^*	68.7^*	58.5
Mean education, y	10.7^*	9.7^*	9.4^*	8.3^*	9.3
Living alone, %	34.1^*	38.4^*	42.6^*	50.8^*	42.4
Marital status, %
• Never married	8.0	6.6	5.5	4.5	5.8
• Married	59.8^*	55.7^*	50.2^*	41.7^*	50.9
• Separated or divorced	4.6	3.3	2.5	2.8	3.0
• Widowed	27.6^*	34.3^*	41.8^*	51.0^*	40.3
Functional status, %
• Excellent or good	93.2^*	81.4^*	57.4^*	30.1^*	62.1
• Mild impairment	5.7^*	13.1^*	29.9^*	44.7^*	25.7
• Moderate or severe impairment	1.1^*	5.4^*	12.7^*	25.3^*	12.2
Troubles interfere with activities, %
• A great deal	0.0^*	7.0^*	34.7^*	52.0^*	22.9
• A little	14.8^*	28.5^*	42.4^*	35.0^*	34.1
• Not at all	85.2^*	64.5^*	32.9^*	12.9^*	43.0
Mean MMSE score (range 0–30)	27.5^*	26.7^*	26.2^*	25.2^*	26.2
Mean CES-D score (range 0–60)	3.2^*	4.7^*	8.3^*	12.4^*	7.6

CES-D—Centre for Epidemiologic Studies Depression Scale, MMSE—Mini-Mental State Examination.
↵* Denotes significant difference between groups (P < .05).