Table 4 Discrete choice experiment results

Pain Efficacy ^b (decreasing)

1.00 (0.97-1.04)

N/A^a

0.08 (0.04-0.11)

Mode of action ^c (Slow OA ^a )

1.17 (1.09-1.25)*

5

13.83 (13.73-13.93)

Dose frequency ^b (once/day)

1.02 (0.96-1.08)

0.58 (0.42-0.75)

Treatment Schedule ^c (daily)

0.90 (0.89-0.9)*

4

4.11 (3.92-4.29)

Cost ^b (increasing)

0.97 (0.97-0.98)*

2

N/A^a

Prescription ^b (Yes)

1.03 (0.97-1.09)

N/A ^a

1.00 (0.83-1.16)

Side effects

Drowsy/constipated^c

1.55 (1.48-1.62)*

6

18.06 (17.90-18.23)

Heartburn/reflux, stomach ulcers^c

0.76 (0.75-0.78)*

3

10.67 (10.55-10.78)

High blood pressure, heart/kidney/liver problems^c

0.09 (0.08-0.11)*

1

90.50 (89.38-91.62)

Constant ^b (α)

N/A^a

N/A^a

Model Fit Statistics

Log Likelihood

−1271

McFaddens ρ2 adjusted

0.37

AIC^a

0.869