Table 3.

Within-individual short-term associations between acute/subacute and chronic pain, and sickness absence days

Model	All	High occupational class	Low occupational class	P value for the occupational class interaction†
	IRR (95% CI)	IRR (95% CI)	IRR (95% CI)
Pain (ref group: no pain)
Acute or subacute pain	1.13* (1.01 to 1.27)	1.05 (0.89 to 1.24)	1.29** (1.10 to 1.50)	0.051
Chronic pain	1.32*** (1.19 to 1.47)	1.25** (1.08 to 1.46)	1.43*** (1.23 to 1.66)	0.135
Health
Long-standing illness	1.32*** (1.19 to 1.46)	1.22* (1.04 to 1.42)	1.38*** (1.19 to 1.60)
Common mental disorders	1.53*** (1.38 to 1.69)	1.56*** (1.36 to 1.80)	1.58*** (1.37 to 1.83)
Working conditions
Mentally strenuous work	0.99 (0.86 to 1.14)	0.94 (0.78 to 1.13)	1.07 (0.87 to 1.31)
Physically strenuous work	1.33*** (1.18 to 1.50)	1.15 (0.95 to 1.40)	1.35*** (1.15 to 1.58)	0.228
Low job control	1.06 (0.94 to 1.20)	1.20 (0.97 to 1.49)	0.98 (0.84 to 1.15)	0.129
Number of observations	11 009	6257	4752

Short-term association is measures by SA days in the survey year. All models are additionally adjusted for survey wave, marital status, night/shift work and part-time work.

*p<0.05; **p<0.01; ***p<0.001.

†Interaction terms for variables differed in the stratified models included to a single model.

IRRs, incidence rate ratios and their 95% CIs.