Table 1 Demographic and background variables for patients without PJI and patients with PJI diagnosis within 90 days of implantation

Age

69.2

9.1

70.1

9.5

BMI^a

29.0

4.6

30.2

5.5

ASA^a

1.98

0.60

2.2

0.60

n

%

n

%

Total

40,384

466

Sex, male

16,453

40.7

272

58.4

 ASA 1–2

18,639

83.6

191

70.7

 ASA 3–4

3647

16.4

79

29.3

 < 18.5, underweight

41

0.2

0

0

 18.5–24.9, normal

4125

18.5

45

16.7

 25–29.9, overweight

9715

43.6

103

38.1

 ≥30, obese

8389

37.7

122

45.2

 OA

39,024

96.6

433

92.9

 Infl. joint dis.

873

2.2

21

4.5

 Post traumatic

199

0.5

8

1.7

 Other

288

0.7

4

0.9

 Cementless

1193

3.0

11

2.4