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Table 4 Proportion of knee complaints among floor layers and graphic designers from the study sample, stratified into age groups

From: Occupational kneeling and radiographic tibiofemoral and patellofemoral osteoarthritis

 

Floor layers

Graphic designers

 

Study attendance*

Study non-attendance†

Study attendance*

Study non-attendance†

Age groups

N‡

n§ (%)

N‡

n§ (%)

RR

95% CI

N‡

n§ (%)

N‡

n§ (%)

RR

95% CI

≤ 49 years

43

23 (53)

45

19 (42)

1.3

0.8–2.0

7

4 (57)

22

5 (23)

2.5

0.9–6.9

50–59 years

72

41 (57)

23

9 (39)

1.5

0.8–2.5

73

23 (32)

42

8 (19)

1.7

0.8–3.4

≥ 60 years

19

6 (32)

29

12 (41)

0.8

0.4–1.7

40

19 (48)

74

12 (16)

2.9

1.6–5.4

  1. Risk ratio (RR) with 95% confidence interval (CI) among those who agreed to attend the radiographic study compared to those who declined
  2. * Floor layers (n = 134); graphic designers (n = 120)
  3. † Floor layers (n = 97); graphic designers (n = 138)
  4. ‡ Total in each age group
  5. § Knee complaints during the past 12 months
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Journal of Occupational Medicine and Toxicology

ISSN: 1745-6673