Table 5 Correlations of the IEQ with psychological factors as measured by the DASS, the PDI and the FW7, comparisons of median values (interquartile ranges in brackets) of patients with and without coded psychological diagnoses, F45.41 = pain disorder with somatic and psychological factors (Mann–Whitney test)

DASS

 Depression

r = 0.6125, p < 0.001

r = 0.5773, p < 0.001

r = 0.5576, p < 0.001

 Anxiety

r = 0.5033, p < 0.001

r = 0.4864, p < 0.001

r = 0.4426, p < 0.001

 Stress

r = 0.4981, p < 0.001

r = 0.4895, p < 0.001

r = 0.4313, p < 0.001

 Total

r = 0.6189, p < 0.001

r = 0.5943, p < 0.001

r = 0.5499, p < 0.001

PDI

r = 0.1132, p = 0.149

r = 0.1004, p = 0.201

r = 0.1165, p = 0.137

FW 7

r = −0.2927, p < 0.0001

r = −0.2741, p = 0.0014

r = −0.2831, p < 0.001

Coded diagnoses

 F45.41

Yes 25.0 (17.0–32.0)

No 17.0 (14.0–20.0)

, p < 0.001

Yes 9.0 (4.0–14.0)

No 5.0 (4.0–7.0)

p = 0.011

Yes 16.0 (12.0–18.0)

No 11.0 (8.0–12.0)

p = 0.001

 Depression

Yes 28.0 (21.5–34.0)

No 20.0 (14.0–27.0)

p < 0.001

Yes 12.0 (7.5–15.0)

No 6.0 (3.0–11.0)

p < 0.001

Yes 17.0 (13.0–20.0)

No 14.0 (10.0–17.0)

, p < 0.001

 Anxiety

Yes 29.0 (20.0–35.0)

No 24.0 (17.0–30.0)

p = 0.190

Yes 12.0 (5.5–17.5)

No 8.0 (4.0–13.0)

p = 0.186

Yes 16.0 (12.0–19.5)

No 15.0 (12.0–18.0)

p = 0.342

 Sleep disorder

Yes 24.0 (17.0–30.0)

No 22.0 (16.0–31.0)

p = 0.448

Yes 9.0 (5.0–13.0)

No 8.0 (4.0–14.0)

p = 0.640

Yes 16.0 (12.0–128.0)

No 14.0 (11.0–18.0)

p = 0.303