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The problem
Intervention: Genetic testing for NRF2 gene polymorphisms (rs6721961 and rs35652124) to determine if genetic variation explains individual differences in the association between anxiety/depression and pain
Who it was tested with: 724 adolescents from the IMAGEN longitudinal study, assessed at ages 14-15 and 16-17.
The same group is measured before the intervention and again afterwards, with a baseline and an endline and sometimes a midline. Change is visible, but other causes cannot be ruled out.
"Anxiety and depression symptoms were assessed using the Development and Well-Being Assessment (DAWBA), and pain complaints were measured via the Children's Somatization Inventory (CSI)...Regression analyses tested main effects, followed by genotype-stratified analyses." The study measured internalising symptoms and pain outcomes at two time points and tested whether genetic variation moderated their association, providing evidence of moderation but without a comparison or control condition.
This is an observational study that identifies associations but cannot establish causal mechanisms. The study does not directly test biological pathways or explain why NRF2 polymorphisms influence the anxiety-pain relationship. Findings require replication in other cohorts.
Across countries and designs
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