Table 1 Continuous and rank-ordered independent variables

Age (years)

913

44.38

12.07

-0.08

0.020

Education level (1 = low, 2 = intermediate, 3 = high)

913

2.17

0.69

0.10

0.004

Net income per month (1-5^a)

733

3.86

1.10

0.05

0.151

Date of enrolment (0 = 1 Jan 1999, 7 = 1 Jan 2006)

913

2.35

1.82

0.03

0.341

AM medications in pre-study year (patient-months)

913

7.00

11.56

-0.03

0.335

Non-AM medications in pre-study year (patient-months)

913

10.91

14.89

-0.08

0.011

Psychotherapy in the pre-study year (sessions)

906

4.18

13.18

-0.01

0.809

Physiotherapy in the pre-study year (sessions)

913

8.73

17.96

-0.09

0.008

Disease duration (years)

913

7.84

9.23

-0.11

0.001

Disease severity at baseline (0-10)

902

6.68

1.74

0.10

0.004

Symptom Score at baseline (0-10)

913

6.01

1.77

0.47

< 0.001

Comorbid disorders (number)

913

1.76

1.34

-0.08

0.018

Chronic Disease Score (0-17 in this study) [65]

913

0.75

1.52

-0.08

0.014

SF-36 Physical Function Scale at baseline (0-100) [66]

909

75.46

23.35

0.04

0.240

SF-36 Role Physical Scale at baseline (0-100)

905

46.14

39.42

-0.06

0.071

SF-36 Role Emotional Scale at baseline (0-100)

900

50.19

41.64

-0.05

0.109

SF-36 Social Functioning Scale at baseline (0-100)

912

60.09

26.59

-0.09

0.008

SF-36 Bodily Pain Scale at baseline (0-100)

911

54.22

28.56

-0.05

0.129

SF-36 Vitality Scale at baseline (0-100)

910

38.55

18.81

-0.06

0.052

SF-36 Mental Health Scale at baseline (0-100)

910

54.21

19.37

-0.09

0.009

SF-36 General Health Scale at baseline (0-100)

902

50.65

19.34

0.00

0.917

SF-36 General Health Item at baseline (1 = excellent, 5 = poor)

908

3.58

0.77

-0.05

0.155

SF-36 Health Change Item at baseline^b

910

3.25

1.07

0.12

< 0.001

SF-36 Physical Component Summary at baseline

887

43.22

10.52

0.01

0.876

SF-36 Mental Component Summary at baseline

887

38.20

12.28

-0.07

0.029

Center for Epidemiological Studies Depression Scale, German version at baseline (0-60) [67]

860

21.31

11.50

0.08

0.016

Physicians' clinical experience (years since qualification)

124^c

18.20^c

7.44^c

-0.01

0.748

Number of patients enrolled by the physician

124^c

7.36^c

10.69^c

0.06

0.073

Duration of consultation with physician at study enrolment (1-5^d)

913

1.87

1.06

-0.01

0.826

Physician's therapy goal for the patient at study enrolment (1-6^e)

911

2.78

1.23

0.07

0.042

Therapists' clinical experience (years since qualification)

123^e

12.04^e

^7.23e

0.06

0.077

AM therapy in months 0-6 (therapy sessions)

905

8.79

8.71

0.06

0.062

AM medications in months 0-6 (patient-months)

911

6.57

7.83

-0.08

0.022

Non-AM medications in months 0-6 (patient-months)

911

6.33

8.22

-0.11

0.002

Psychotherapy in months 0-6 (therapy sessions)

906

2.51

7.67

-0.01

0.752

Physiotherapy in months 0-6 (therapy sessions)

909

3.91

9.74

-0.07

0.036