Table 5 Predicting PIA in eac patients: results of backward stepwise regression, incorporating MSUS variables

Age

(years)

<50:

0

≥50:

1

-1.24

0.36

11.81

0.001

0.29 (0.14 to 0.59)

Sx Durn

(weeks)

n/a

-0.03

0.01

11.182

0.001

0.97 (0.96 to 0.99)

SJC /72

<1:

0

≥1:

1

1.42

0.32

19.21

<0.001

4.14 (2.19 to 7.80)

CRP

(g/l)

<5:

0

5 to 14:

1

0.64

0.22

8.43

0.004

1.89 (1.23 to 2.92)

≥14:

2

ACPA

Neg:

0

Pos:

1

4.97

1.07

21.74

<0.001

143.7(18 to 1060)

ESR

(mm/h)

24:

0

≥24:

1

1.00

0.36

7.74

0.005

2.72 (1.34 to 5.51)

Presence of Grade I grey-scale synovitis in ≥3/16 joints

No:

0

Yes:

1

1.6

0.34

17.22

<0.001

4.91 (2.32 to 10.4)

Constant

-1.62

0.34

22.68

<0.001