Table 4 Multivariable analysis of factors associated with serum NA levels in patients with SLE

Disease duration

Ratio given per five-year increase

2.24 (1.55, 3.26)

<0.001

Age (at diagnosis) *

Age

0.01 (0.00, 0.04)

<0.001

Age²

2.58 (1.86, 3.56)

Ethnicity

Caucasian

1

Afro-Caribbean

2.99 (1.35,6.65)

Other

14.9 (5.82, 38.0)

<0.001

Anti-La

No

1

Yes

0.16 (0.06, 0.49)

<0.001

Anti-Sm

No

1

Yes

28.2 (14.4, 55.3)

<0.001

Disease activity in renal system

A, B

1

C, D, E

3.78 (2.07,6.90)

<0.001

Immunosuppression

No

1

Yes

1.45 (1.02, 2.05)

0.04

Albumin

Ratio per 5 g/l increase

1.12 (1.01,1.24)

0.03