Table 3 The adjusted odds ratio of perioperative infection for patients with RA.

From: Acute surgical site infection after total knee arthroplasty in patients with rheumatoid arthritis versus osteoarthritis

 

90-day infection

One-year infection

OR (95% CI)

p-value

OR (95% CI)

p-value

PS SMRW-weighted logistic regressiona

(RA:OA = 1126:63,215)

(RA:OA = 887:48,818)

Model 1

OA

1

0.955

1

0.924

RA

0.985 (0.585, 1.658)

1.027 (0.595, 1.773)

Model 2

OA

1

0.884

1

0.838

RA

0.96 (0.553, 1.665)

1.062 (0.598, 1.885)

Sex

Male

1

   

Female

0.496 (0.268, 0.916)

0.025*

  

Blood transfusion

1.650 (0.934, 2.914)

0.085+

  

Hospital level

Medical center

  

1

 

Regional hospital

  

1.197 (0.585, 2.447)

0.623

Local hospital

  

1.805 (0.898, 3.628)

0.097+

PS matchingb

(RA:OA = 1066:3198)

(RA:OA = 842:2526)

Model 1

OA

1

1.000

1

0.613

RA

1.000 (0.581, 1.722)

0.842 (0.433, 1.638)

Model 2

OA

1

0.598

1

0.26

RA

0.81 (0.371, 1.768)

0.463 (0.121, 1.766)

Hospital level

Medical center

1

   

Regional hospital

0.831 (0.135, 5.136)

0.843

  

Local hospital

5.862 (1.018, 33.765)

0.048*

  
  1. CI, confidence interval; OA, osteoarthritis; OR, odds ratio; PS, propensity score; RA, rheumatoid arthritis. Model 1: correction with diagnosis (RA/OA); Model 2: correction with diagnosis (RA/OA), sex, age, hypertension, hyperlipidemia, diabetes mellitus, length of stay, blood transfusion, and hospital level.
  2. *p-value < 0.05; +0.05 < p-Value < 0.1
  3. aWeighted logistic regression for original data, using standardized mortality ratio weighting (SMRW).
  4. bPS matching with conditional logistic regression.
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