Table 2 Models for opiate use among fibromyalgia patients from two ethnic groups (N = 7686)

Age

1.013***

1.007–1.019

1.063***

1.041–1.087

Gender (male)

1.004

0.836–1.206

0.552*

0.333–0.911

Socio-economic level

 High (reference)

–

–

–

–

 Middle

1.128

0.990–1.286

0.338*

0.142–0.788

 Low

1.368***

1.197–1.563

1.141

0.791–1.642

Disease duration

0.991

0.980–1.002

1.002

0.971–1.035

BMI

1.021***

1.012–1.030

1.051***

1.022–1.082

Another localized pain syndrome

2.079***

1.556–2.814

8.500**

2.023–59.293

Psychiatric co-morbidity

1.168**

1.045–1.306

1.334

0.962–1.852

Charlson score

1.104***

1.069–1.141

0.934

0.830–1.053

Treatment with a recommended drug

2.835***

2.530–3.179

3.104***

2.220–4.376