| Scales and Medical Records | Subscales and variables | At the time of survey |
| the Japanese Brief Pain Inventory Short Form | Worst pain Average pain Interference with daily life “In the last 24 hours, how much relief have pain treatments or medications provided?” | Enrollment 2 weeks 4 weeks |
| the Opioid Self-Management Scale for Advanced Cancer Patients | Managing opioids and coping with pain Talking to healthcare providers Talking to family and friends Recording pain and opioid use Living with the disease Understanding pain characteristics | Enrollment 4 weeks |
| the Japanese version of the Barriers Questionnaire | Fatalism Addiction side effects Progression Tolerances distraction | Enrollment 4 weeks |
| the Japanese version of the EQ-5D-5L | Degree of mobility Self-care Usual activities Pain/Discomfort Anxiety/Distraction | Enrollment 4 weeks |
| Medical records Items | Age, sex, type of cancer, stage, past history, and treatment | Enrollment |
| Data on prescribed medications Status of consultation with specialists on pain relief Costs due to worsening | Enrollment 2 weeks 4 weeks |