Repetitive negative thinking, meaning in life, and serum cytokine levels in pregnant women: varying associations by socioeconomic status

Elevated proinflammatory cytokines and decreased antiinflammatory cytokines are important in the context of perinatal health, and immune dysregulation has been found among perinatal women with low socioeconomic status (SES). Data examining psychological factors that may contribute to cytokines in pregnancy are lacking. Of importance, these associations may be most evident among women with low SES. This study examined the moderating role of SES on associations among presence of meaning in life and repetitive negative thinking with cytokine levels among 67 pregnant women. A cumulative SES index was calculated using income, education, perceived social class, and receipt of governmental support. Measures included the Perseverative Thinking Questionnaire, Meaning in Life Questionnaire, and serum interleukin (IL)-6 as well as IL-4. Using PROCESS, moderation analyses showed significant interactions between psychological factors and SES in predicting serum cytokines. In the context of high SES only, greater repetitive negative thinking was associated with higher levels of the proinflammatory cytokine IL-6 (p = 0.056) while greater meaning in life was associated with higher levels of the antiinflammatory cytokine IL-4 (p = 0.02). Findings from this study suggest that the benefits of these psychological factors on cytokine levels may be most readily observable among women with greater economic stability. Identifying psychological factors that positively contribute to biological functioning in women experiencing heightened economic distress will be crucial in addressing SES-related disparities in perinatal health.