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Table 1 The interactive categories of two factors and the interactive relationship

From: Ecological determinants of effect of a free pit and fissure sealant program in Shanxi, China, 2017–2018

Judging rules

Types of interaction effects

q(X1 ∩ X2) < Min(q(X1), q(X2))

Non-linearly weakened

Min(q(X1), q(X2)) < q(X1 ∩ X2) < Max(q(X1), q(X2))

Univariate non-linearly weakened

q(X1 ∩ X2) > Max(q(X1), q(X2))

Bivariate enhanced

q(X1 ∩ X2) = q(X1) + q(X2)

Independent

q(X1 ∩ X2) > q(X1) + q(X2)

Non-linearly enhanced