Fig. 1

Brief Pain Inventory short form (BPI-sf). Brief Pain Inventory questionnaire; a pain assessment tool that measures both the intensity of pain (sensory dimension) and interference of cancer pain in the patient’s life (reactive dimension). From the 1st–6th question pain history, site, worst pain, least pain, average pain, and pain intensity right now utilizing numerical rating pain scale of 10. (Visual analogue score VAS). Pain severity score PSS was calculated by addition of the values of items (3 + 4 + 5 + 6) and then dividing by 4 this gives a severity score out of 10 (1–3 mild pain, 4–6 moderate pain, 7–10 sever pain). Item numbers 7and 8 described types of medications used for pain management and how much pain relief patients got in terms of percentage. Pain interference score PIS was calculated by adding the scores for questions (9A + 9B + 9C + 9D + 9E + 9F + 9G) and then dividing by 7, this gives an interference score out of 10