Table 1 Basic background characteristics of the study population in hip (THA) and knee (TKA) arthroplasty in 2010 − 2013 and 2014 − 2017

Gender †

Women

56

57

66

65

Age (years)^a

-49

5

5

3

3

50–54

6

6

6

6

55–59

10

10

11

11

60–64

16

14

17

15

65–69

18

20

17

20

70–74

18

18

19

18

75–79

15

15

16

15

80 + 

12

12

11

11

Comorbidities^a

1

15

16

17

18

2 + 

4

5

4

5

Education^a

Basic

46

38

49

39

Secondary

31

34

33

38

Higher

23

27

18

23

Occupation^a

Higher white-collar

14

16

11

13

Lower white-collar

30

32

31

34

Blue-collar

36

34

39

36

Farmer

10

8

10

7

Other

10

10

9

10

Income

Lowest

18

15

18

14

2

28

27

30

27

3

21

21

21

23

4

16

18

16

18

Highest

17

19

15

18

Population need^b

Musculoskeletal disorder index

78, 193

65, 166

78, 193

65, 166

Number of operations

28 139

31 271

40 620

43 242