Table 1.

Baseline sociodemographic variables

	Cognitively unimpaired (N = 2,329)	Non- amnestic MCI (N = 641)	Amnestic- single domain MCI (N = 259)	Amnestic- multiple domain MCI (N = 197)	P value
Age (mean and SD in years)	72.0 (5.5)	73.8 (6.1)	74.4 (6.0)	76.4 (6.4)	<0.001
Gender (% women)	53.5%	66.8%	37.8%	62.9%	<0.001
Education					<0.001
Little or no formal education (≤ 5 years)	49.5%	61.6%	52.1%	61.4%
Primary studies (6–11 years)	32.1%	30.3%	42.9%	31.0%
≥ Secondary studies (≥12 years)	18.5%	8.1%	5.0%	7.6%
Mean of diseases (SD) (comorbidity)*	2.9 (1.7)	3.2 (1.7)	2.9 (1.9)	2.9 (1.7)	<0.001

^*Comorbidity included 13 diseases: hypertension, diabetes mellitus, hyperlipidemia, heart disease, cancer, anemia, chronic obstructive pulmonary disease, psychiatric disorders, osteoarthritis, osteoporosis, hearing loss, cataracts, peripheral vascular disease..