Table 3.

Results of the threshold and saturation effect analysis of relative fat mass (RFM) and gallstones

Outcome	Gallstone
Model 1
Linear effect	1.09(1.08,1.10) < 0.0001
Model 2
breaking point (K)	21.63
<K-segment effect 1	1.49(0.80,2.77) 0.2072
>K-segment effect 2	1.09(1.07, 1.10) < 0.0001
Difference between 2 and 1 effects	0.73(0.39,1.36) 0.3207
LLR	0.190

Models 1 and 2 are evaluations of linear and nonlinear relationships, respectively. It is usually assumed that when the likelihood ratio (LLR) is less than 0.05, there is a nonlinear association between the independent and dependent variables.