“…Based on previous studies [7, 8, 19], we controlled for the following important demographic and socioeconomic factors, as well as health status, as covariates in our model:
- Patients' characteristics: Patients' age, language spoken/used at home (English, Spanish and other languages), educational status, residence region (Northeast, Midwest, South and West), whether the residence is in a metropolitan statistical area (MSA) and survey year.
- Patients' weight status: BMI was calculated from self-reported weight and height, e.g.,normal weight (18.5 ≤ BMI ≤ 24.9), overweight (25.0 ≤ BMI ≤ 29.9), and obesity (BMI ≥30.0).
- Count of the patient's chronic diseases based on respondents' reports of: diabetes mellitus, lipid metabolism disorder, essential hypertension, hypertension with complications and secondary hypertension, acute myocardial infarction, coronary atherosclerosis and other heart diseases, nonspecific chest pain, acute cerebrovascular disease, other cerebrovascular diseases, transient cerebral ischemia, cancers, coma, stupor and brain damage, paralysis, gout and other crystal arthropathies, and blindness. The number of chronic conditions ranged from 0 to 10.
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