Summary of the data collection methods in SZ-ageing
| Data collection methods | Measurements | Variables |
| Standardised questionnaires survey | ||
| Sociodemographics | National ID, name, date of birth, age, sex, current address, permanent residence address (Hukou address), nationality, preretirement occupation, educational level, marital status and type of medical insurance | |
| History of drug allergy | Penicillin, sulfanilamide, streptomycin and other drugs | |
| Lifestyle behaviours | Dietary behaviours, physical activity, smoking habits, alcohol habits | |
| Occupational disease inductive factors exposure history | Dust, radioactive substance, physical agent and hazardous chemical substances | |
| History of personal disease | Hypertension, diabetes, coronary heart disease, chronic obstructive pulmonary disease, malignant tumour, cerebrovascular disease, kidney disease, heart disease, vascular disease, eye disease, neurological diseases, tuberculosis, hepatitis and occupational disease | |
| Family history of disease | Hypertension, diabetes, coronary heart disease, chronic obstructive pulmonary disease, malignant tumour, stroke, severe mental diseases, tuberculosis, hepatitis and congenital malformation | |
| Others | Genetic history, history of surgery, history of trauma, sedentary behaviours and self-rated health status | |
| Standardised scale assessments | ||
| Activities of daily living assessment | Katz Basic Activities of Daily Living Scale and Lawton’s Instrumental Activities of Daily Living Scale | |
| Physical performances assessment | Short Physical Performance Battery | |
| Cognitive function assessment | Mini-Mental State Examination, Montreal Cognitive Assessment, self-reported Ascertain Dementia 8-item Questionnaire | |
| Anxious assessment | Generalized Anxiety Disorder Scale-7 | |
| Depress assessment | Patient Health Questionnaire-2 | |
| Sleep quality assessment | Pittsburgh Sleep Quality Index | |
| Frailty assessment | The FRAIL Scale (Fatigue, Resistance, Ambulation, Illnesses, and Loss of Weight) | |
| Clinical measurements | Physical examinations | Height, weight, body mass index, waist circumference, blood pressure; the inspection–palpation–percussion–auscultation approach is used to find visual abnormalities in the eyes, pharyngeal, oral cavity, thorax, lung, heart, liver, spleen, skin, lymph gland and limbs |
| Others | Abdominal colour Doppler ultrasound (liver, gallbladder, pancreas, spleen, kidney), ECG examination, body composition examination, handgrip strength measurement, ultrasound bone mineral density examination of calcaneus | |
| Clinical laboratory tests | Hepatic function | Total bilirubin, direct bilirubin, indirect bilirubin, alanine aminotransferase (ALT), aspartate aminotransferase (AST), ALT/AST, AST/ALT, alkaline phosphatase, glutamine transpeptidase, total protein, albumin (ALB), globulin (GLB) and ALB/GLB |
| Kidney function | Urinary microalbumin, urinary creatinine, serum creatinine, serum urea, β2 microglobulin and serum uric acid | |
| Serum lipids | Total cholesterol, triglyceride, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, apolipoprotein A1 and apolipoprotein B | |
| Tumour biomarkers | Carcinoembryonic antigen and alpha fetoprotein | |
| Others | Blood routine examination, urine routine examination, fasting plasma glucose, fasting insulin, glycated haemoglobin A1c, 25 hydroxyvitamin D, Apolipoprotein E, lipoprotein A and homocysteine |