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Table 1 Hip osteoarthritis risks in males according to the study of Kaila-Kangas et al. [10]

From: Dose-response relationship between cumulative physical workload and osteoarthritis of the hip – a meta-analysis applying an external reference population for exposure assignment

Category

Duration of exposure

Manually handled weights

Frequency per shift

Percentage of participants in the corresponding category

Mean percentile of exposure

Risk estimate (OR)

1

0 yrs.

>  20 kg

≥ 10×

53.6%b

27th

1.0 -

2

1–12 yrs.a

>  20 kg

≥ 10×

16.1%b

62nd

1.1 (95% CI 0.4–3.2)

3

13–24 yrs.a

>  20 kg

≥ 10×

12.7%b

76th

2.2 (95% CI 0.8–5.9)

4

>  24 yrs.a

>  20 kg

≥ 10×

17.6%b

91st

2.3 (95% CI 1.2–4.3)

  1. aone working year corresponds to 220 working days
  2. bThe authors only specify the case numbers in the single exposure categories; for the total participants, the numbers were obtained from the authors [11]. The mean percentiles of exposure are based on these percentages. To calculate the mean percentile of exposure, the cumulative percentage of the less exposed categories plus the halved percentage of the considered category were summed up. For example, the mean percentile of exposure for category 4 was calculated as the (53.6 + 16.1 + 12.7 + 17.6/2) = 91st percentile