Table 3 Binary logistic regression between presence of fibromyalgia, DAS28 score, and serum vitamin D respectively

Binary logistic regression between DAS28 score and presence of fibromyalgia

B

S.E

Wald

df

Sig

Exp (B)

95% C.I. for EXP(B)

Lower

Upper

Rheumatoid arthritis

 2.751

.820

11.255

1

.001

15.664

3.139

78.162

Psoriatic arthritis

 1.909

.971

3.867

1

.049

6.746

1.006

45.226

Binary logistic regression between vitamin “D” level and presence of fibromyalgia

 B

S.E

Wald

df

Sig

Exp(B)

95% C.I. for EXP(B)

Lower

Upper

Rheumatoid arthritis

  − .410-

.117

12.358

1

.000

.663

.528

.834

Psoriatic arthritis

  − .132-

.068

3.796

1

.051

.876

.767

1.001