Table I.

Characteristics of the sample at baseline (2001) stratified by type of disease (n=12,207^a)

	Infectious	Chronic	Both	Neither
	Mean (SD)b	Mean (SD)b	Mean (SD)b	Mean (SD)b	p-value
Total Sample Size (n=12,207a)	370	6,062	1,114	4,661
Age Mean (SD)	60.5 (9.1)	63.5 (9.7)	62.8 (9.5)	61.1 (9.5)	*
	%b	%b	%b	%b	p-value
Sex
Male	3.8%	42.9%	6.5%	46.9%	*
Female	2.4%	55.4%	11.4%	30.8%
Marital Status
Singlec	2.9%	47.7%	9.9%	39.5%	***
Marriedd	3.2%	48.4%	8.5%	39.9%
Widowed	2.2%	56.8%	10.9%	30.2%
Location
Urban	2.9%	50.6%	9.4%	37.0%	*
Rurale	3.2%	47.8%	8.6%	40.4%
Education
Low	3.1%	50.8%	9.9%	36.2%	*
Moderate	3.2%	51.3%	10.3%	35.2%
High	2.9%	47.5%	7.7%	41.9%
Assets (tertiles individual level)f
Low	3.0%	50.0%	9.7%	37.4%	**
Medium	3.2%	49.9%	9.0%	37.9%
High	2.9%	49.1%	8.7%	39.3%
Wealth index (tertiles)g
Low	3.3%	46.8%	9.1%	40.8%	**
Medium	3.0%	51.0%	9.1%	36.9%
High	1.1%	54.2%	9.1%	35.6%

^*p<0.001;

^**p<0.01;

^***p<0.05

Data for this study was collected in rural and urban locations in Mexico by the Instituto Nacional de Estadística y Geografía (INEGI) as part of the Mexican Health and Aging Study (MHAS/ENASEM).

Note: p-values indicate ANOVA results using an unweighted model to compare the four categories

^aSample size across variables may vary due to missing values

^bWeights used when estimating means, standard deviations (SD), and percentages

^cIncludes single, divorced, or separated

^dIncludes married and cohabitation

^eRural regions have ≤100,000 inhabitants

^fCalculated in Mexican Pesos

^gWealth index uses the first factor of principal component analysis (see Methods section).