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Table 1 Demographic and other cohort characteristics

From: Sjogren’s syndrome is associated with higher rate of non-home discharge after primary hip arthroplasty and higher transfusion rates after primary hip or knee arthroplasty: a U.S. cohort study

 

Primary TKA

Primary THA

Entire cohort

No Sjogren’s Syndrome

Sjogren’s Syndrome

Entire cohort

No Sjogren’s Syndrome

Sjogren’s Syndrome

National Projectionsa

N = 8,127,282a

N = 8,114,510a

N = 12,772a

N = 4,116,485a

N = 4,110,263a

N = 6222a

Age, Mean (SE); median

66.4 (0.03); 66.5

66.6 (0.02); 66.5

65.0 (0.20); 64.7

65.2 (0.04); 65.9

65.5 (0.04); 66.0

65.7 (0.32); 65.4

Age category

  < 50

430,141 (5.3%)

429,384 (5.3%)

757 (5.9%)

449,642 (10.9%)

449,170 (10.9%)

472 (7.6%)

 50–64

2,872,619 (35.3%)

2,867,321 (35.3%)

5298 (41.5%)

1,364,821 (33.2%)

1,362,528 (33.1%)

2293 (36.9%)

 65–79

3,969,942 (48.8%)

3,963,938 (48.8%)

6004 (47.0%)

1,732,015 (42.1%)

1,729,250 (42.1%)

2765 (44.4%)

  ≥ 80

850,131 (10.5%)

849,418 (10.5%)

713 (5.6%)

566,521 (13.8%)

565,828 (13.8%)

693 (11.1%)

Gender

 Female

5,126,809 (63.1%)

5,114,641 (63.0%)

12,168 (95.3%)

2,330,188 (56.6%)

2,324,441 (56.6%)

5747 (92.4%)

 Male

2,985,796 (36.7%)

2,985,197 (36.8%)

599 (4.7%)

1,776,722 (43.2%)

1,776,247 (43.2%)

475 (7.6%)

Race

 White

5,507,281 (67.8%)

5,497,996 (67.8%)

9285 (72.7%)

2,882,041 (70.0%)

2,877,245 (70.0%)

4796 (77.1%)

 Black

472,393 (5.8%)

471,784 (5.8%)

609 (4.8%)

225,772 (5.5%)

225,579 (5.5%)

193 (3.1%)

 Hispanic

340,292 (4.2%)

339,802 (4.2%)

490 (3.8%)

104,384 (2.5%)

104,234 (2.5%)

150 (2.4%)

 Other/Missing

1,807,101 (22.2%)

1,804,713 (22.2%)

2388 (18.7%)

904,234 (22.0%)

903,151 (22.0%)

1083 (17.4%)

Deyo-Charlson Score

 0

4,104,090 (50.5%)

4,100,452 (50.5%)

3638 (28.5%)

2,193,574 (53.3%)

2,191,576 (53.3%)

1998 (32.1%)

 1

2,064,888 (25.4%)

2,060,861 (25.4%)

4027 (31.5%)

926,286 (22.5%)

924,372 (22.5%)

1914 (30.8%)

  ≥ 2

1,958,305 (24.1%)

1,953,198 (24.1%)

5107 (40.0%)

996,623 (24.2%)

994,314 (24.2%)

2309 (37.1%)

Primary Diagnosis

 Rheumatoid arthritis

64,126 (0.8%)

63,422 (0.8%)

704 (5.5%)

29,173 (0.7%)

28,938 (0.7%)

235 (3.8%)

 Aseptic bone necrosis

21,031 (0.3%)

20,963 (0.3%)

68 (0.5%)

285,623 (6.9%)

284,864 (6.9%)

759 (12.2%)

 Osteoarthritis

7,866,436 (96.8%)

7,854,625 (96.8%)

11,811 (92.5%)

3,447,224 (83.7%)

3,442,590 (83.8%)

4634 (74.5%)

 Other

173,672 (2.1%)

173,488 (2.1%)

184 (1.4%)

354,307 (8.6%)

353,713 (8.6%)

594 (9.5%)

 Fracture

1904 (0.0%)

1904 (0.0%)

0 (0.0%)

117 (0.0%)

117 (0.0%)

0 (0.0%)

Hospital Location/Teaching

 Rural

1,041,159 (12.8%)

1,040,000 (12.8%)

1159 (9.1%)

444,188 (10.8%)

443,736 (10.8%)

452 (7.3%)

 Urban

3,665,766 (45.1%)

3,660,404 (45.1%)

5362 (42.0%)

1,722,391 (41.8%)

1,719,952 (41.8%)

2439 (39.2%)

 Urban Teaching

3,398,114 (41.8%)

3,391,899 (41.8%)

6215 (48.7%)

1,939,989 (47.1%)

1,936,692 (47.1%)

3297 (53.0%)

Insurance

 Medicaid

226,917 (2.8%)

226,680 (2.8%)

237 (1.9%)

138,809 (3.4%)

138,668 (3.4%)

141 (2.3%)

 Medicare

4,631,192 (57.0%)

4,623,773 (57.0%)

7419 (58.1%)

2,234,674 (54.3%)

2,230,839 (54.3%)

3835 (61.6%)

 Other

267,624 (3.3%)

267,297 (3.3%)

327 (2.6%)

102,277 (2.5%)

102,205 (2.5%)

72 (1.2%)

 Private

2,947,676 (36.3%)

2,942,954 (36.3%)

4722 (37.0%)

1,600,830 (38.9%)

1,598,692 (38.9%)

2138 (34.4%)

 Self

36,589 (0.5%)

36,535 (0.5%)

54 (0.4%)

32,307 (0.8%)

32,288 (0.8%)

19 (0.3%)

Income Category

 0-25th percentile

1,511,693 (18.6%)

1,509,616 (18.6%)

2077 (16.3%)

653,243 (15.9%)

652,323 (15.9%)

920 (14.8%)

 25-50th percentile

2,156,222 (26.5%)

2,153,260 (26.5%)

2962 (23.2%)

1,009,677 (24.5%)

1,008,178 (24.5%)

1499 (24.1%)

 50-75th percentile

2,158,012 (26.6%)

2,154,363 (26.5%)

3649 (28.6%)

1,086,953 (26.4%)

1,085,319 (26.4%)

1634 (26.3%)

 75-100th percentile

2,151,430 (26.5%)

2,147,588 (26.5%)

3842 (30.1%)

1,285,854 (31.2%)

1,283,805 (31.2%)

2049 (32.9%)

Hospital Bed size

 Small

1,408,128 (17.3%)

1,405,774 (17.3%)

2354 (18.4%)

685,209 (16.6%)

684,163 (16.6%)

1046 (16.8%)

 Medium

2,107,249 (25.9%)

2,103,919 (25.9%)

3330 (26.1%)

1,037,561 (25.2%)

1,036,014 (25.2%)

1547 (24.9%)

 Large

4,589,661 (56.5%)

4,582,609 (56.5%)

7052 (55.2%)

2,383,797 (57.9%)

2,380,202 (57.9%)

3595 (57.8%)

Hospital Region

 Northeast

1,359,230 (16.7%)

1,357,194 (16.7%)

2036 (15.9%)

818,699 (19.9%)

817,401 (19.9%)

1298 (20.9%)

 Midwest

2,269,799 (27.9%)

2,266,484 (27.9%)

3315 (26.0%)

1,089,883 (26.5%)

1,088,481 (26.5%)

1402 (22.5%)

 South

2,957,629 (36.4%)

2,953,077 (36.4%)

4552 (35.6%)

1,358,856 (33.0%)

1,356,707 (33.0%)

2149 (34.5%)

 West

1,540,624 (19.0%)

1,537,755 (19.0%)

2869 (22.5%)

849,045 (20.6%)

847,673 (20.6%)

1372 (22.1%)

In-hospital Complications and Healthcare Utilization

Transfusion

1,288,545 (15.9%)

1,286,034 (15.8%)

2511 (19.7%)

937,802 (22.8%)

935,821 (22.8%)

1981 (31.8%)

Implant Infection

8165 (0.1%)

8151 (0.1%)

14 (0.1%)

7592 (0.2%)

7573 (0.2%)

19 (0.3%)

Implant Revision

15,310 (0.2%)

15,281 (0.2%)

29 (0.2%)

17,931 (0.4%)

17,884 (0.4%)

47 (0.8%)

Death

7875 (0.1%)

7865 (0.1%)

10 (0.1%)

8889 (0.2%)

8880 (0.2%)

9 (0.2%)

Discharge Status

 Home

4,965,279 (61.1%)

4,957,619 (61.1%)

7660 (60.0%)

2,448,107 (59.5%)

2,444,859 (59.5%)

3248 (52.2%)

 Rehabilitation/inpatient facility

3,130,288 (38.5%)

3,125,196 (38.5%)

5092 (39.9%)

1,649,103 (40.1%)

1,646,152 (40.0%)

2951 (47.4%)

Hospital stay in days: Mean (SE); median

3.53 (0.01); 2.70

3.54 (0.01); 2.70

3.48 (0.03); 2.68

3.71 (0.01); 2.74

3.73 (0.01); 2.75

3.76 (0.06); 2.77

Hospital stay in days

  ≤ 3

5,218,769 (64.2%)

5,210,306 (64.2%)

8463 (66.3%)

2,499,883 (60.7%)

2,496,141 (60.7%)

3742 (60.1%)

  > 3

2,908,513 (35.8%)

2,904,204 (35.8%)

4309 (33.7%)

1,616,602 (39.3%)

1,614,122 (39.3%)

2480 (39.9%)

Total Hospital Charges, in U.S. $, Mean (SE); Median

42,336 (235); 35,891

42,441 (236); 35,946

46,429 (646); 39,793

44,635 (268); 37,658

44,859 (270); 37,785

50,084 (980);

42,495

  1. aU.S. National estimates were based on the following actual counts in the NIS, which is a 20% sample of all U.S. hospitalizations (https://www.hcup-us.ahrq.gov/nisoverview.jsp): TKA,N = 1,690,531; No Sjogren’s syndrome, N = 1,687,895; Sjogren’s syndrome, N = 2636; THA, N = 855,634; No Sjogren’s syndrome, N = 854,353; Sjogren’s syndrome, N = 1281; N (%), unless specified otherwise
  2. Overall, 12,772 (0.2%) of people with TKA hospitalizations had Sjogren’s Syndrome; 6222 (0.2%) of people with THA hospitalizations had Sjogren’s Syndrome