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To investigate the association between the metabolic syndrome-insulin resistance index (METS-IR) and the risk of kidney stones, as well as its potential threshold effect.
Data were obtained from individuals undergoing health screening at the Affiliated Hospital of Yangzhou University in 2022. This cross-sectional study included 80 046 eligible participants. Participants were divided into three tertile groups based on METS-IR levels. Multivariate logistic regression was used to analyze the association between METS-IR and kidney stone risk. Piecewise linear regression was applied to evaluate the threshold effect, with sex-stratified and multiple subgroup analyses conducted.
The prevalence of kidney stones increased with higher METS-IR tertiles (low: 3.83%, medium: 6.47%, high: 9.91%). After multivariate adjustment, each standard deviation increase in METS-IR was associated with a 20% higher risk of kidney stones in women (OR=1.20, 95% CI: 1.08-1.33) and a 24% higher risk in men (OR=1.24, 95% CI: 1.18-1.31). Compared with the low METS-IR group, the high METS-IR group had a 41% higher risk in women (OR=1.41, 95% CI: 1.13-1.74) and a 56% higher risk in men (OR=1.56, 95% CI: 1.37-1.78), both showing significant dose-response relationships. A clear threshold effect was observed in men (inflection point=43.72, P<0.001), where each 1-unit increase in METS-IR below the inflection point was associated with a 5% higher risk (OR=1.05, 95% CI: 1.04-1.06), while the association weakened above the inflection point (OR=1.01, 95% CI: 1.00-1.02).
METS-IR is significantly associated with kidney stone risk, with a threshold effect observed in men. METS-IR may serve as a potential marker for assessing kidney stone risk, providing a new perspective for early screening and intervention, particularly in high-risk populations at the early stage of metabolic abnormalities.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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