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Table 2 Weighted univariate logistic analysis of RA

From: The association between systemic immune-inflammation index and rheumatoid arthritis: evidence from NHANES 1999–2018

Character

OR 95% CI

P-value

Age

 Below 60

ref

ref

 Over 60

4.501 (4.024, 5.034)

<0.0001

BMI

 Below 25

ref

ref

 25–30

1.224 (1.064, 1.409)

0.005

 Over 30

2.018 (1.758, 2.317)

<0.0001

PIR

 Below 1.3

ref

ref

 1.3–3.5

0.698 (0.601, 0.810)

<0.0001

 Over 3.5

0.476 (0.406, 0.557)

<0.0001

Gender

 Male

ref

ref

 Female

1.545 (1.377, 1.733)

<0.0001

Race

 White

ref

ref

 Black

1.485 (1.307, 1.687)

<0.0001

 Mexican American

0.684 (0.580, 0.806)

<0.0001

 Other

0.760 (0.633, 0.912)

0.003

Edu

 Under high school

ref

ref

 High school or equivalent

0.719 (0.631, 0.818)

<0.0001

 College graduate or above

0.453 (0.391, 0.524)

<0.0001

Hypertension

 No

ref

ref

 Yes

3.925 (3.461, 4.450)

<0.0001

Diabetes

 No

ref

ref

 Pre-diabetes

1.753 (1.474, 2.084)

<0.0001

 Diabetes

3.043 (2.711, 3.416)

<0.0001

Hyperlipidemia

 No

ref

ref

 Yes

2.041 (1.770, 2.354)

<0.0001

Alcohol use

 Never

ref

ref

 Former

1.589 (1.341, 1.882)

<0.0001

 Mild

0.730 (0.612, 0.869)

<0.001

 Moderate

0.557 (0.453, 0.684)

<0.0001

 Heavy

0.511 (0.420, 0.621)

<0.0001

Smoke

 Never

ref

ref

 Former

1.968 (1.704, 2.272)

<0.0001

 Now

1.626 (1.408, 1.878)

<0.0001

Work activity

 No

ref

ref

 Yes

0.753 (0.678, 0.837)

<0.0001

SII

1.296 (1.166, 1.441)

<0.0001