Association of dietary quality indicators with gallstones in the US: NHANES 2017鈥�2020

Table 3 Threshold Effect Analysis of the Association between DII and gallstones using a two-Piecewise Linear Regression Model: identification of thresholds

Gallstones	Adjust OR (95% CI)	P-value
DII	听	听
Fitting by standard linear model	1.086 (1.017, 1.159)	0.014
Fitting by two-piecewise linear model	听	听
Inflection point	1.842	听
&濒迟;鈥�1.80	1.034 (0.955, 1.121)	0.408
&驳迟;鈥�1.80	1.275 (1.074, 1.513)	0.006
Log-likelihood ratio	0.049	听

1. outcome variable: gallstones (0鈥�=鈥塶o gallstones, 1鈥�=鈥塯allstones), analyzed using multivariate logistic regression
2. exposure variable: DII, included in the model as a continuous variable
3. Age, sex, race, education, poverty-to-income ratio, body mass index, large weight loss, alcohol use, smoking, physical activity, diabetes, hypertension, HF, CHD, angina pectoris, heart attack, total calorie, total cholesterol, estrogen use status, antihyperglycemic drug use status, statin use status, glucocorticosteroid use status were adjusted

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