If an examination across populations reveals that the causal factors are similar, then the efficacy of interventions would be similar.

Causal Factors

Elements or conditions that can directly influence the occurrence or development of a phenomenon or outcome.

Population Efficacy

The effectiveness of a treatment or intervention when applied to a broad population under 'real-world' conditions.

Interventions

Actions or processes conducted to modify an outcome or conditions in a study or therapeutic context.