Table 4.

Threshold effect analysis.

Outcome	OR (95%)	P-vale
Break Point	1.92 (1.883,1.956)	NA
slope1	2.647 (2.406~2.913)	<0.001
slope2	1.327 (1.245~1.414)	<0.001
Likelihood Ratio test	–	<0.001
Non-linear Test*1	–	<0.001
Non-linear Test*2	–	<0.001

Covariates are adjusted using variables in Model 4.