A new pathway for considering trigger factors based on parallel-serial connection models and displaying the relationships of causal factors in low-probability events.

According to the standardized parallel-connection model used to evaluate the relationships and the effect size of an observed factor considering trigger factors, SAR values range from 0 to 0.24 for low effect sizes or weakly significant factors (which could be understood as one of more four factors that may play a role in disease incidence under the standard model), from 0.25 to 0.49 for medium effect sizes (which imply that one of two or three factors may play a role in disease incidence), and over 0.50 for high effect sizes (which imply that mainly one factor plays a role in disease incidence).

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