Corrigendum

Online Summary

Correction to: Frakes E, Risser R, Ball T, Hochberg M, Wohlreich M. Duloxetine Added to Nonsteroidal Anti-inflammatory Drugs for Treatment of Knee Pain Due to Osteoarthritis: Results of a Randomized, Double-blind, Placebo-controlled Trial. Curr Med Res Opin. 2011;27(12):1-12.

Correction to: Frakes E, Risser R, Ball T, Hochberg M, Wohlreich M. Duloxetine Added to Nonsteroidal Anti-inflammatory Drugs for Treatment of Knee Pain Due to Osteoarthritis: Results of a Randomized, Double-blind, Placebo-controlled Trial. .

The authors have been made aware of an omission in Table 3. As described in the text, the table should have shown results of the PGI-Improvement scale.

This error did not affect the text or any of the study results or conclusions.

The authors report the following Table 3 which has been revised to include the PGI-Improvement scores:

Table 3.  Secondary efficacy assessments for patients with osteoarthritis (OA) who were randomly allocated to treatment with duloxetine or placebo.

	Placebo		Duloxetine		Between-group p value
	n	Mean (SE)	n	Mean (SE)
Diary-based pain scores
Worst pain	253	−1.58 (0.13)	259	−2.61 (0.13)	<0.001
Night pain	253	−1.46 (0.11)	259	−2.26 (0.11)	<0.001
WOMAC scores*
Total	253	−14.38 (1.11)	251	−21.34 (1.09)	<0.001
Physical function	253	−13.81 (1.13)	251	−21.10 (1.13)	<0.001
Pain	256	−15.60 (1.15)	258	−22.05 (1.10)	<0.001
Stiffness	256	−16.38 (1.38)	258	−22.63 (1.38)	<0.001
BPI-Pain
Average pain	256	−1.54 (0.17)	258	−2.56 (0.14)	<0.001
Least pain	256	−1.25 (0.13)	258	−1.95 (0.13)	<0.001
Worst pain	256	−1.61 (0.16)	258	−2.71 (0.16)	<0.001
Pain right now	256	−1.80 (0.15)	258	−2.51 (0.15)	<0.001
BPI-Interference
General activity	256	−1.56 (0.17)	258	−2.60 (0.16)	<0.001
Mood	256	−1.56 (0.15)	258	−2.43 (0.15)	<0.001
Walking ability	256	−1.73 (0.16)	258	−2.67 (0.17)	<0.001
Normal work	256	−1.61 (0.16)	258	−2.68 (0.16)	<0.001
Relations with others	255	−1.01 (0.14)	258	−1.85 (0.13)	<0.001
Sleep	256	−1.68 (0.14)	258	−2.52 (0.14)	<0.001
Enjoyment of life	256	−1.55 (0.16)	258	−2.58 (0.15)	<0.001
PGI-Improvement	254	2.94 (0.08)	254	2.44 (0.08)	<0.001

*WOMAC Total score and all subscale scores have been normalized to a 0–100 scale.

Abbreviations: BPI, Brief Pain Inventory; SE, standard error; n, number of patients; PGI, Patient Global Impression; WOMAC, Western Ontario and McMaster Universities Index of Osteoarthritis.