Revisiting classification of pain from bone metastases as mild, moderate, or severe based on correlation with function and quality of life.

Revisiting classification of pain from bone metastases as mild, moderate, or severe based on correlation with function and quality of life.

Chow Edward; Ding Keyue; Parulekar Wendy R; Wong Rebecca K S; van der Linden Yvette M; Roos Daniel; Hartsell William F; Hoskin Peter; Wu Jackson S Y; Nabid Abdenour; Ong Francisca; van Tienhoven Geertjan; Babington Scott; Demas William F; Wilson Carolyn F; Brundage Michael; Zhu Liting; Meyer Ralph M

Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer

2016

2016-04

PURPOSE: The objective of our study was to determine the optimal cut points for classification of pain scores as mild, moderate, and severe based on interference with function and quality of life (QOL). METHODS: We evaluated 822 patients who completed the Brief Pain Inventory (BPI) and/or the European Organization for Research and Treatment of Cancer (EORTC) QOL Questionnaire Core 30 (QLQ-C30) prior to receiving repeat radiation therapy for previously irradiated painful bone metastases. Optimal cut points for mild, moderate, and severe pain were determined by the MANOVA that yielded the largest F ratio for the between category effect on the seven interference items of BPI and the six functional domains of QOL (physical, role, emotional, cognitive, social functioning, and global QOL) as indicated by Pillai's Trace, Wilk's lambda, and Hostelling's Trace F statistics. RESULTS: For BPI and for QOL domains separately, the two largest F ratios for Wilk's lambda, Pillai's Trace, and Hotelling's Trace F statistics were from the cut points 4, 8 and 6, 8. When combining both, the optimal cut points were 4, 8 with 1-4 (mild), 5-8 (moderate), and 9-10 (severe). With this classification, the mean scores of all the seven interference items in BPI and the six functional domains were all highly statistically different. Patients with severe pain survived significantly shorter than those with mild and moderate pain (p \textless 0.0001). CONCLUSION: Our analysis supports the classification of pain scores as follows: 1-4 as mild pain, 5-8 as moderate pain, and 9-10 as severe pain. This may facilitate conduct of future clinical trials.

*Quality of Life; *Severity of Illness Index; 80 and over; 80 and Over; Adolescence; Adolescent; Adult; Aged; Bone metastases; Bone Neoplasms; Bone Neoplasms – Complications; Bone Neoplasms/*complications/secondary; Brief Pain Inventory; Female; Functional interference; Funding Source; Human; Humans; Male; Middle Age; Middle Aged; Pain – Classification; Pain – Etiology; Pain Measurement – Methods; Pain Measurement/*methods; Pain severity; Pain/*classification/etiology; Quality of life; Quality of Life; Questionnaires; Re-irradiation; Severity of Illness Indices; Survival; Young Adult

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

1617–1623

4

24