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Table 2 Characteristics of cases and controls

From: Association between occupation and knee and hip replacement due to osteoarthritis: a case-control study

 

THR only

n = 896

TKR only

n = 400

THR and TKR

n = 112

Controls

n = 1082

Sex, n (%)

    

   Men

399 (69.3)

134 (23.3)

43 (7.5)

490

   Women

497 (59.7)

266 (32.0)

69 (8.3)

592

Age, mean (SD) years

    

   Men

74.7 (7.4)

73.9 (6.5)

74.2 (6.5)

71.0 (7.0)

   Women

74.9 (7.8)

73.5 (7.2)

74.3 (8.1)

70.5 (7.1)

BMI, mean (SD) kg/m2

    

   Men

26.0 (3.2)

26.6 (3.2)

26.8 (3.1)

25.4 (2.9)

   Women

25.2 (4.2)

27.0 (4.4)

26.3 (3.1)

25.2 (3.5)

Occupation, n (%)

    

   Managers and professionals

    

Men

27 (6.8)

7 (5.2)

3 (7.0)

59 (12.0)

Women

46 (9.3)

15 (5.6)

6 (8.7)

48 (8.1)

   Technicians and clerks

    

Men

39 (9.8)

11 (8.2)

1 (2.3)

60 (12.2)

Women

67 (13.5)

27 (10.2)

7 (10.1)

95 (16.0)

   Service and shop workers

    

Men

28 (7.0)

5 (3.7)

3 (7.0)

30 (6.1)

Women

89 (17.9)

43 (16.2)

8 (11.6)

106 (17.9)

   Farmers

    

Men

140 (35.1)

43 (32.1)

10 (23.3)

83 (16.9)

Women

77 (15.5)

52 (19.5)

18 (26.1)

95 (16.0)

   Fishermen

    

Men

36 (9.0)

25 (18.7)

14 (32.6)

62 (12.7)

Women

0 (0)

0 (0)

0 (0)

0 (0)

   Craft workers

    

Men

78 (19.5)

30 (22.4)

6 (14.0)

122 (24.9)

Women

69 (13.9)

40 (15.0)

5 (7.2)

82 (13.9)

   Operators and unskilled labour

    

Men

51 (12.8)

13 (9.7)

6 (14.0)

74 (15.1)

Women

46 (9.3)

35 (13.2)

11 (15.9)

70 (11.8)

   Housewives

    

Men

0 (0)

0 (0)

0 (0)

0 (0)

Women

103 (20.7)

54 (20.3)

14 (20.3)

96 (16.2)

  1. THR: total hip replacement; TKR: total knee replacement