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Compared to subjects with a null score, women with low household load showed a lower rate (IRR=0.85; 95%CI 0.72, 1.0. Compared to low strain jobs, passive jobs (IRR=1.21; 95%CI 1.02, 1.44) and high strain jobs (IRR=1.46; 95%CI 1.02, 2.09) showed higher rates. In general, our analysis yielded different results, if not opposite, when data were stratified by sex. Sex may then represent an effect modifier of the relation between social factors and chronic pain. Low socioeconomic status and high job strain household load are related to chronic