• Nguyen Van Giang, Hsiao-Yean Chiu, Duong Hong Thai, Shu-Yu Kuo, and Pei-Shan Tsai.
• Graduate Institute of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan; Department of Internal Medicine, Thainguyen University of Medicine and Pharmacy, Thainguyen, Vietnam.
• Pain Manag Nurs. 2015 Oct 1; 16 (5): 678-84.

AbstractPain is common in patients after orthopedic surgery. The 11-face Faces Pain Scale has not been validated for use in adult patients with postoperative pain. To assess the validity of the 11-face Faces Pain Scale and its ability to detect responses to pain medications, and to determine whether the sensitivity of the 11-face Faces Pain Scale for detecting changes in pain intensity over time is associated with gender differences in adult postorthopedic surgery patients. The 11-face Faces Pain Scale was translated into Vietnamese using forward and back translation. Postoperative pain was assessed using an 11-point numerical rating scale and the 11-face Faces Pain Scale on the day of surgery, and before (Time 1) and every 30 minutes after (Times 2-5) the patients had taken pain medications on the first postoperative day. The 11-face Faces Pain Scale highly correlated with the numerical rating scale (r = 0.78, p < .001). When the scores from each follow-up test (Times 2-5) were compared with those from the baseline test (Time 1), the effect sizes were -0.70, -1.05, -1.20, and -1.31, and the standardized response means were -1.17, -1.59, -1.66, and -1.82, respectively. The mean change in pain intensity, but not gender-time interaction effect, over the five time points was significant (F = 182.03, p < .001). Our results support that the 11-face Faces Pain Scale is appropriate for measuring acute postoperative pain in adults.Copyright © 2015 American Society for Pain Management Nursing. Published by Elsevier Inc. All rights reserved.

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