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Table 1 Baseline characteristics of the participants

From: Digital self-management of hip and knee osteoarthritis and trajectories of work and activity impairments

 

Included

Excluded

Knee (n = 8,801)

Hip (n = 5,875)

Total (n = 14,676)

n = 1,979

Female, n (%)

6,530 (74.2)

4,549 (77.4)

11,079 (75.5)

1493 (75.4)

Age, mean (± SD)

64.0 (± 9.0)

64.1 (± 9.2)

64.0 (± 9.1)

65.7 (± 10.3)

 21–50 years, n (%)

648 (7.4)

443 (7.5)

1,091 (7.4)

158 (8.0)

 51–65 years, n (%)

4,184 (47.5)

2,691 (45.8)

6,875 (46.9)

755 (38.2)

 66–74 years, n (%)

2,931 (33.3)

2,002 (34.1)

4,933 (33.6)

678 (34.3)

 75 + years, n (%)

1,038 (11.8)

739 (12.6)

1,777 (12.1)

388 (19.6)

Education, n (%)

 Less than high school

701 (8.0)

483 (8.2)

1,184 (8.1)

180 (9.1)

 High school

3,149 (35.8)

2,120 (36.1)

5,269 (33.9)

703 (35.5)

 College/university

4,951 (56.3)

3,272 (55.7)

8,223 (56.0)

1,096 (55.4)

Body mass index, mean (± SD)

27.6 (± 4.9)

26.5 (± 4.4)

27.2 (± 4.7)

27.2 (± 4.8)

Employment, n (%)

 Working

3,944 (44.8)

2,537 (43.2)

6,481 (44.2)

707 (35.7)

 Not working

445 (5.1)

272 (4.6)

717 (4.9)

139 (7.0)

 Retired

4,412 (50.1)

3,066 (52.2)

7,478 (51.0)

1,133 (57.3)

Diabetes, n (%)

504 (5.7)

318 (5.4)

822 (5.6)

171 (8.6)

Lung diseases, n (%)

917 (10.4)

642 (10.9)

1,559 (10.9)

227 (11.5)

Balance troubles, n (%)

284 (3.2)

205 (3.5)

489 (3.3)

112 (5.7)

Rheumatoid arthritis, n (%)

396 (4.5)

273 (4.7)

669 (4.6)

130 (6.6)

Cardiovascular diseases, n (%)

622 (7.1)

462 (7.9)

1,084 (7.4)

211 (10.7)

Walking difficulties, n (%)

1,027 (11.7)

779 (13.3)

1,806 (12.3)

317 (16.0)

General health, mean (± SD)

6.6 (± 1.9)

6.5 (± 1.8)

6.6 (± 1.8)

6.4 (± 2.0)

Pain, mean (± SD)

5.1 (± 2.0)

5.1 (± 1.9)

5.1 (± 1.9)

5.2 (± 2.1)

Physical function, mean (± SD)

12.6 (± 4.3)

13.0 (± 4.4)

12.8 (± 4.3)

12.0 (± 4.4)

WPAI–OA activity impairment (%), mean (± SD)

40.3 (± 23.8)

37.9 (± 23.4)

39.3 (± 23.7)

41.8 (± 24.9)

WPAI–OA absenteeism (%), mean (± SD)a

2.7 (± 13.4)

2.1 (± 11.4)

2.4 (± 12.7)

2.8 (± 13.0)

WPAI–OA presenteeism (%),mean (± SD)a

21.7 (± 22.8)

22.0 (± 21.2)

21.8 (± 22.2)

23.2 (± 22.7)

WPAI–OA overall work impairment (%), mean (± SD)a

24.4 (± 25.7)

24.1 (± 23.7)

24.3 (± 24.9)

25.9 (± 25.6)

Follow up responses, n (%)

 1

3,614 (41.1)

2,547 (43.4)

6,161 (42.0)

-

 2

2,087 (23.7)

1,445 (24.6)

3,532 (24.1)

-

 3

1,481 (16.8)

893 (15.2)

2,374 (16.2)

-

 4

1,619 (18.4)

990 (16.9)

2,609 (17.8)

-

  1. SD Standard deviation, WPAI-OA Work Productivity and Activity Impairment-Osteoarthritis
  2. aFor participants aged 65 years and younger