Table 2 Separate multinomial logistic regressions relating psychological factors and pain intensities at T1 to number of pain sites (NPS) decrease (NPS T1 > NPS T2) and increase (NPS T1 < NPS T2) compared with reporting a stable number of pain sites (NPS T1 = NPS T2)

Emotional exhaustion

2644

0.81

[0.69–0.95] **

1.34

[1.15–1.57] ***

Mental distress (HSCL)

2752

0.69

[0.54–0.89] ***

1.64

[1.28–2.10] ***

Depression (single item)

2912

0.90

[0.76–1.05]

1.16

[0.99–1.37]

Anxiety (single item)

2909

0.86

[0.66–1.11]

1.09

[0.84–1.41]

  “Had a lot of surplus”

2814

1.02

[0.95–1.10]

0.87

[0.80–0.95] ***

  “Felt down and sad”

2808

0.98

[0.88–1.09]

1.18

[1.06–1.31] ***

Dispositional optimism

2858

1.08

[0.94–1.25]

0.94

[0.81–1.09]

General self-efficacy

2862

0.97

[0.82–1.14]

1.05

[0.88–1.26]

Job satisfaction

2608

1.05

[0.90–1.22]

0.97

[0.82–1.15]

Sleep disturbance

2801

0.87

[0.79–0.96] ***

1.19

[1.07–1.31] ***

Tiredness

2919

0.82

[0.73–0.93] ***

1.24

[1.09–1.40] ***

Restlessness

2915

0.80

[0.69–0.92] ***

1.08

[0.93–1.25]

  Headache

2921

0.81

[0.72–0.91] ***

1.17

[1.04–1.32] **

  Neck pain

2924

0.64

[0.56–0.73] ***

1.02

[0.89–1.17]

  Shoulder pain

2924

0.78

[0.68–0.89] ***

0.98

[0.85–1.12]

  Arm pain

2924

1.09

[0.95–1.25]

0.97

[0.83–1.14]

  Leg pain

2924

1.06

[0.93–1.21]

1.03

[0.88–1.19]

  Back pain

2924

0.85

[0.76–0.96] **

1.06

[0.93–1.20]

Number of pain sites at T1

2924

1.33

[1.22–1.45] ***

0.79

[0.72–0.87] ***