Table 3 Multivariable linear regression models

(Constant)

64.586

3.649

17.698

< 0.001

Age

− 0.051

0.076

− 0.672

0.503

Sex^a

4.362

1.145

3.810

< 0.001***

No. of additional substances in urine

− .797

0.760

− 1.048

0.296

Psychiatric symptom load

− 1.281

1.450

− 0.883

0.379

Depressive state^b

− 0.500

0.078

− 6.390

< 0.001***

Lifetime BZD use

− 4.544

1.720

− 2.641

0.009**

R² = 0.548; adjusted R² = 0.528; n = 139;

(Constant)

61.449

3.429

17.919

< 0.001

Age

− 0.045

0.077

− 0.590

0.556

Sex^a

4.354

1.159

3.756

< 0.001***

No. of additional substances in urine

− 0.444

0.778

− 0.570

0.570

Psychiatric symptom load

− 1.483

1.465

− 1.013

0.313

Depressive state^b

− 0.497

0.080

− 6.239

< 0.001***

Current BZD use

− 2.220

1.154

− 1.924

0.057

R² = 0.537; adjusted R² = 0.516; n = 139;

(Constant)

61.161

3.460

17.677

< 0.001

Age

− 0.050

0.078

− 0.648

0.518

Sex^a

4.487

1.175

3.819

< 0.001***

No. of additional substances in urine

− 0.570

0.783

− 0.728

0.468

Psychiatric symptom load

− 1.622

1.488

− 1.089

0.278

Depressive state^b

− 0.503

0.081

− 6.243

< 0.001***

Prolonged BZD use

− 1.058

1.185

− 0.893

0.373

R² = 0.532; adjusted R² = 0.510; n = 138;

(Constant)

55.981

3.510

15.951

0.001

Age

0.044

0.077

0.563

0.574

Sex^a

4.672

1.143

4.088

0.001***

No. of additional substances in urine

− 0.513

0.746

− 0.688

0.493

Psychiatric symptom load

0.824

1.489

.553

0.581

Depressive state^b

− 0.612

0.084

− 7.293

0.001***

Former BZD use

1.031

1.177

0.876

0.383

R² = 0.563; adjusted R² = 0.540; n = 123