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Table 5 Cox regression of the association between work status (i.e., the prevalence of working at least 25 hours a week) and WSP4limbs, intensity of pain, age, and annual income in the group with chronic pain below the age of 65 (n = 1771 with complete data).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 -
WSP4limbs 0.74 0.56 – 0.99
Unbearable/severe pain intensity 0.80 0.69 – 0.92
Age   
   30–49 0.94 0.79 – 1.13
   50–64 0.76 0.63 – 0.91
Income below median 0.58 0.51 – 0.66
  1. a Number of anatomical regions with pain ≥ 3, frequency of pain, gender, civil status, rural residence, and citizenship 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 = 321).
  3. c The model-based estimate of the prevalence for the reference category, i.e., for persons with chronic (but not widespread, defined as WSP4limbs) pain of at most moderate intensity, below the age of 30, and an income above median was 100% (95% confidence interval 85.6% – 100%).