Table 2.

Measurement, recording, and data source of variables of characterization.

Type of variable		Register rank/format	Measurement	Source of data
Characterization: sociodemographic
	Sex	Male Female	Registration	Medical history
	Age	18-99	Registration	Medical history
	Marital status	Single Married Widower Divorced/separated	Registration	Registration
	Nationality	Spanish European Union Rest of Europe North America Latin America Africa Asia Other	Registration	Registration
	Education level	No education Primary school Secondary school University degree Master’s degree Doctorate	Registration	Registration
	Occupation	Employed Self-employed Unemployed Retired Permanently disabled Homemaker Student Other	Registration	Registration
Characterization: clinical
	Main diagnosis	ICD-9-CMa codes: 402.01 402.11 402.91 404.01 404.11 409.91 428.x	Registration	Medical history
	Years since diagnosis	0-100	Registration	Medical history
	Other secondary chronic pathologies	ICD-9-CM codes	Registration	Medical history
	HFb signs/symptoms (dyspnea, orthopnea, fatigue, edema, oliguria, paroxysmal nocturnal dyspnea, high venous pressure, crackles R3/R4, murmurs and hepatomegaly)	Yes No	Registration or exploration or anamnesis	Medical history
	Cardiovascular risk factors (smoking, diabetes mellitus II, obesity [weight/BMI], hypertension, previous heart disease, dyslipidemia)	Yes No	Registration or exploration or anamnesis	Medical history
	HF functional classification (establishes the functional severity of HF based on stress tolerance)	I: No limitation. Regular physical activity does not cause dyspnea, fatigue, or palpitations. II: Slight limitation. Usual physical activity causes dyspnea, fatigue, or palpitations. III: Marked limitation (minor activities cause symptoms). IV: Inability to perform any activity. Symptoms even at rest.	NYHAc Functional Classification [31]	Registration medical history

^aICD-9-CM: International Classification of Diseases, 9th revision, Clinical Modification.

^bHF: heart failure.

^cNYHA: New York Heart Association.