Table 3.

Cox regression of the association between widespread pain recent week, defined as WSP 4limbs, and WSPconlimbs, respectively and gender, age, sick leave or pre-retirement, annual income, and citizenship (n = 7637).^a

	WSP4limbs		WSPconlimbs
Explanatory variable	Prevalence ratio (PR)	95% confidence interval	Prevalence ratio (PR)	95% confidence interval
Reference category	1.0b	-	1.0c	-
Age effect among females
Age
< 30	0.51	0.22 – 1.16	0.65	0.33 – 1.27
30–49	2.56	1.47 – 4.44	2.83	1.76– 4.54
50–64	3.80	2.18 – 6.63	4.49	2.79 – 7.21
65-	3.99	2.23 – 7.13	3.92	2.37 – 6.50
Age effect among males
Age
30–49	1.23	0.65 – 2.31	1.50	0.89 – 2.54
50–64	1.81	0.98 – 3.34	2.21	1.32 – 3.69
65-	2.83	1.47 – 5.44	2.84	1.63 – 4.96
Sick leave/pre-retirement	2.76	2.13 – 3.58	2.47	2.00 – 3.05
Income below median	1.79	1.41 – 2.28	1.46	1.21 – 1.76
Non-Nordic citizen	2.40	1.56 – 3.71	1.86	1.24 – 2.78

^a Civil status and urban residence had no significant impact on the pain prevalence and did not act as confounders and were thus omitted from the regression model.

^b The model-based estimate of the prevalence for the reference category, i.e., for male Nordic-citizens below the age of 30, not on sick leave or pre-retired, and with an income above median was 1.2% (95% confidence interval 0.7 – 2.1%).

^c The model-based estimate of the prevalence for the reference category, i.e., for male Nordic-citizens below the age of 30, not on sick leave or pre-retired, and with an income above median was 2.0% (95% confidence interval 1.3 – 3.2%).