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Table 4 Cox regression of the association between work status (i.e., the prevalence of working at least 25 hours a week) and number of anatomical regions with pain ≥ 3, WSP4limbs, age, annual income, and citizenship in the group below the age of 65 (n = 5780).a,b.

From: Prevalence of widespread pain and associations with work status: a population study

Explanatory variable Prevalence ratio (PR) 95% confidence interval
Reference categoryc 1.0 -
Number of anatomical regions with pain ≥ 3 0.88 0.81 – 0.94
WSP4limbs 0.75 0.62 – 0.92
Age   
   30–49 0.99 0.90 – 1.09
   50–64 0.77 0.70 – 0.86
Income below median 0.62 0.57 – 0.66
Non-Nordic citizen 0.74 0.57 – 0.95
  1. a Acute or chronic (but not necessarily widespread, defined as number of anatomical regions with pain ≥ 3 or WSP4limbs) pain, gender, civil status, and rural residence had no significant impact on the prevalence of working at least 25 hours a week and did not act as confounders and were thus omitted from the regression model.
  2. b Full-time students and persons on full-time parental leave were excluded (n = 803).
  3. c The model-based estimate of the prevalence for the reference category, i.e., for Nordic citizens without widespread pain, defined as number of anatomical regions with pain ≥ 3 or WSP4limbs, below the age of 30, and an income above median was 96.9% (95% confidence interval 88.3% – 100%).