Table 2

Major variables in the National Health Insurance Service-National Health Screening Cohort database

Domain		Variables	Year
Domain		Variables	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013
Target health problems	Hypertension	Systolic blood pressure	√	√	√	√	√	√	√	√	√	√	√	√
	Hypertension	Diastolic blood pressure	√	√	√	√	√	√	√	√	√	√	√	√
	Diabetes mellitus	Fasting blood glucose	√	√	√	√	√	√	√	√	√	√	√	√
	Dyslipidaemia	Total cholesterol	√	√	√	√	√	√	√	√	√	√	√	√
		Triglyceride								√	√	√	√	√
		HDL (high densitiy lipoprotein) cholesterol								√	√	√	√	√
		LDL (low density lipoprotein) cholesterol								√	√	√	√	√
	Anaemia	Haemoglobin	√	√	√	√	√	√	√	√	√	√	√	√
	Kidney/urinary disease	Urine glucose	√	√	√	√	√	√	√
		Urine blood	√	√	√	√	√	√	√
		Urine pH	√	√	√	√	√	√	√
		Urine protein	√	√	√	√	√	√	√	√	√	√	√	√
	Chronic kidney disease	Creatinine								√	√	√	√	√
	Liver disease	AST (aspartate transaminase)[SGOT (serum glutamic-oxaloacetic transaminase)]	√	√	√	√	√	√	√	√	√	√	√	√
		ALT (alanine transaminase)[SGPT (serum glutamic-pyruvic transaminase)}	√	√	√	√	√	√	√	√	√	√	√	√
		r-GTP (gamma-glutamyl transpeptidase)	√	√	√	√	√	√	√	√	√	√	√	√
	Frailty/lower leg weakness	Neurological examination for lower leg for subjects at age 40 or 66						√	√	√	√	√	√	√
	Osteoporosis	Bone density for subjects at age 40 or 66						√	√	√	√	√	√	√
	Periodontal diseases	Dental examination	√	√	√	√	√	√	√	√	√	√	√	√
	Cognitive impairment, depression	Mental health screening						√	√	√	√	√	√	√
	Common and uncommon diseases	Disease diagnosis per ICD-10 codes; Operation and procedure history, Medication history (generic name code, dose, duration of prescription, and material codes)	√	√	√	√	√	√	√	√	√	√	√	√
	All-cause and cause- specific deaths	Vital statistics including dates and causes of deaths	√	√	√	√	√	√	√	√	√	√	√	√
Risk factors	Cigarette smoking	Cigarette smoking status	√	√	√	√	√	√	√	√	√	√	√	√
		Daily smoking dose	√	√	√	√	√	√	√
		Past daily smoking dose								√	√	√	√	√
		Current daily smoking dose								√	√	√	√	√
		Smoking duration	√	√	√	√	√	√	√
		Smoking duration (ex-smoker)								√	√	√	√	√
		Smoking duration (current smoker)								√	√	√	√	√
	Alcohol	Drinking frequency	√	√	√	√	√	√	√
		Days of drinking per week								√	√	√	√	√
		Amount of drinking per count	√	√	√	√	√	√	√
		Amount of drinking per day								√	√	√	√	√
	Obesity	Body mass index	√	√	√	√	√	√	√	√	√	√	√	√
	Obesity	Waist circumference							√	√	√	√	√	√
	Physical activity	Days of activity per week	√	√	√	√	√	√	√
		Days of vigorous activity per week								√	√	√	√	√
		Days of moderate activity per week								√	√	√	√	√
		Days of mild activity per week								√	√	√	√	√
	Dental caries, etc	Dental examination	√	√	√	√	√	√	√	√	√	√	√	√
Medical history and family history	Medical history	Hypertension, diabetes mellitus, dyslipidaemia, pulmonary tuberculosis, stroke, ischaemic heart disease, etc	√	√	√	√	√	√	√	√	√	√	√	√
Medical history and family history	Family history	Hypertension, diabetes mellitus, stroke, ischaemic heart disease etc	√	√	√	√	√	√	√	√	√	√	√	√
Healthcare usage		Date of visit, types of medical institutions (clinics/hospitals/tertiary hospitals/public health centres), types of visit (inpatient/outpatient/emergency/intensive care), length of stay, medical cost (insurer/patient)	√	√	√	√	√	√	√	√	√	√	√	√
Healthcare provider		Location, type of hospitals, no of beds, medical equipment, human resources, specialties of physicians	√	√	√	√	√	√	√	√	√	√	√	√
Socioeconomic and demographic factors		Age, sex, age, residential area, insurance type (the employee insured, the self-employed insured, dependents, medical aid), monthly insurance contributions (a proxy for income), types and grades of disabilities	√	√	√	√	√	√	√	√	√	√	√	√