Table 1 Summary of joint surgery admissions among patients with and without rheumatoid arthritis (RA)

Joint surgery admissions, n (%)

3654 (1.2)

304,935 (98.8)

Female, n (%)

2727 (74.6)

139,184 (45.6)

<0.0001

Age, median years (interquartile range)

64 (54–72)

54 (39–67)

<0.0001

 Smoker

386 (10.6)

40,958 (13.4)

<0.0001

 Hypertension

308 (8.4)

16,269 (5.3)

<0.0001

 dyslipidaemia

39 (1.1)

2612 (0.86)

0.170

 Diabetes mellitus

218 (6.0)

12,682 (4.2)

<0.0001

 Peripheral vascular disease

16 (0.44)

410 (0.13)

<0.0001

 Pulmonary disease

74 (2.0)

1892 (0.62)

<0.0001

 Peptic ulcer disease

12 (0.33)

269 (0.09)

<0.0001

 Renal disease

56 (1.5)

1744 (0.57)

<0.0001

 Liver disease

2 (0.05)

104 (0.03)

0.504

 Cerebrovascular accident

21 (0.57)

787 (0.26)

<0.0001

 Congestive heart failure

56 (1.5)

1673 (0.55)

<0.0001

 Cancer or metastatic cancer

15 (0.14)

844 (0.28)

0.127

 Paraplegia

16 (0.44)

466 (0.15)

<0.0001

 Dementia

6 (0.16)

333 (0.11)

0.318

 Human immunodeficiency disease

0

40 (0.01)

0.489

Lowest quartile of socioeconomic status^a, n (%)

446 (12.2)

32,312 (10.6)

0.002

High accessibility to goods and services^b, n (%)

3214 (88.0)

269,242 (88.3)

0.301

Public hospital patient, n (%)

1343 (36.8)

76,246 (25.0)

<0.0001

Elective admission, n (%)

3428 (93.8)

294,892 (96.7)

<0.0001

English-speaking country of birth, n (%)

3119 (85.4)

259,100 (85.0)

0.512

Hip and knee total, partial or revision arthroplasty, n (%)

2028 (55.5)

81,094 (26.6)

<0.0001