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Two-piecewise linear regression and logarithmic likelihood ratio test explained the threshold effect analysis of the TyG index with age at the first gallstone surgery.
| TyG index | ULR test | PLR test | LRT test |
|---|---|---|---|
| β (95% CI) | β (95% CI) | P-value | |
| < 9.26 | − 0.44(-3.10, 2.22) | 3.34 (− 0.64, 7.32) | 0.010 |
| > = 9.26 | − 5.87 (− 10.89, − 0.85) |
ULR univariate linear regression, PLR piecewise linear regression, LRT logarithmic likelihood ratio test.
Statistically significant: P < 0.05.
