Components/ exposures
General Age, sex, education, employment status and history, spouse’s employment, marital status and number and type of marriages (first-degree or second-degree familial marriage or none); anthropometric measures: weight, height, waist & hip circumference, residence area, domestic and international travels, use of landline and mobile phones, internet access, smoking history; exposure to passive smoking, alcohol consumption, physical activity, sleep duration and quality, daily activities, occupational exposures, cooking and heating fuel, dwelling status, living arrangements, hygiene status of the dwelling and its facilities, drinking water source, history of exposure to animals, agricultural toxins and household pesticides, annual reading rate, access to a freezer, access to a washing machine, access to a dishwasher, access to a computer, access to the internet, access to a motorcycle, access to a car (no access, access to a car with price of <50 million  tomans, and access to a car with price of >50 million tomans), access to a vacuum cleaner, color television (TV) type (no color TV or regular color TV vs. Plasma color TV), owning a mobile, owning a PC or laptop, international trips in a lifetime (never, pilgrimage, both pilgrimage and non-pilgrimage trips)
Nutrition Food Frequency Questionnaire (FFQ), including 153 items; dietary habits during the past year and current; food preparation and storage techniques
Medical history Current and past medical history, family history of diseases, self-rated health, history of falls and fractures, pain, digestive symptoms, angina, neurological symptoms, history of transfusion, oral health condition, current use of medications, use of drugs
General health (GHQ12) Psychological distress, social dysfunction, ability to concentrate, sleep deprivation, ability to make decisions, feeling under stress, ability to overcome difficulties, enjoying healthy activities, facing up problems, feeling unhappy and depressed, losing confidence, thinking of self as worthless, feeling reasonably happy
Quality of life (WHO-QOL) Physical health, mental health, social health, environmental health, self-esteem, interpersonal relationships, sexual activity, social support, home environment, health care, transport, pain, work capacity, mobility, daily activities, leisure activities, financial support, bodily image, security, access to information
Chronic stressor and coping strategies Stress domains consist of household stress, financial pressure, social relationships, personal and professional conflicts, educational concerns, job security, loss and separation, sexual life, daily life, health concerns, exercising, seeking religious support, focusing on the positive, social distancing, acting out, binge-drinking and binge-eating
Social capital Memberships, trust, coherence, ability, the value of life, tolerance of diversity, connections, family and friends, neighbors, work colleagues, community participation, feelings of trust and safety, proactivity