Table 1 Demographics and comorbidities for patients undergoing primary total hip arthroplasty

Age (years) mean ± SD

63.9 ± 11.0

67.7 ± 10.2

 < 0.001

Gender

 < 0.001

 Female

45,210

44.6%

58,657

67.2%

BMI (kg/m²)

 < 0.001

  < 18

333

0.3%

492

0.6%

 18–25

16,522

16.3%

17,773

20.4%

 25–30

34,058

33.6%

28,490

32.6%

 30–35

28,208

27.9%

21,806

25.0%

 35–40

14,546

14.4%

12,053

13.8%

  > 40

7625

7.5%

6723

7.7%

Functional status prior to surgery

 < 0.001

 Independent

99,871

98.6%

85.864

98.3%

 Dependent

1421

1.4%

1473

1.7%

ASA

 < 0.001

 1

3775

3.7%

2822

3.2%

 2

53,429

52.8%

46,766

53.6%

 3

42,353

41.8%

36,260

41.5%

  ≥ 4

1735

1.7%

1489

1.7%

Diabetes mellitus

 < 0.001

 No diabetes mellitus

89,009

87.8%

76,018

87.0%

 Non-insulin-dependent diabetes mellitus

9488

9.4%

8758

10.0%

 Insulin-dependent diabetes mellitus

2795

2.8%

2561

3.0%

Smoker

 < 0.001

 No

86,850

85.7%

79,577

91.1%

 Yes

14,442

14.3%

7760

8.9%

Congestive heart failure

0.007

 No

100,996

99.7%

87,020

99.6%

 Yes

296

0.3%

317

0.4%