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Two-piecewise linear regression explained the threshold effect analysis of WII with gallstone prevalence
| WWI | ULR Test | PLR Test | LRT Test |
|---|---|---|---|
| OR (95% CI) | OR (95% CI) | OR (95% CI) | |
| < 12.7, (n = 7761) | 1.34 (1.20,1.49) | 1.45 (1.29,1.63) | 0.002 |
| ≥ 12.7, (n = 243) | 0.39 (0.17,0.90) |
ULR, univariate linear regression; PLR, piecewise linear regression; LRT, logarithmic likelihood ratio test, statistically significant: P = 0.002
