borderline significanceP = 0.074
Logistic regression suggested a linear inverse association (OR = 0.982), while RCS revealed a U-shaped pattern with borderline significance ( P = 0.074).
Logistic regression suggested a linear inverse association (OR = 0.982), while RCS revealed a U-shaped pattern with borderline significance ( P = 0.074).
Because the nonlinear trend did not reach statistical significance and the ascending limb of the U-shaped curve was based on limited observations, ALP was entered as a linear term in the final logistic regression model to maintain parsimony and avoid overfitting.