Nonlinear association between blood urea nitrogen to creatinine ratio and obstructive sleep apnea: a cross-sectional study from NHANES

Table 3 The threshold effect analysis of the BUCR on OSA risk

Outcome	the effect size	95%CI	P value
Model 1 Fitting model by standard linear regression	1.014	(1.004–1.023)	0.004
Model 2 Fitting model by two-piece wise linear regression
Inflection point	10.86
< 10.86	1.05	(1.01–1.09)	0.014
> 10.86	1.01	(0.996–1.02)	0.189
P for likelihood ratio test			0.068

OR Odds Ratio, CI Confidence Intervals, BUCR Blood Urea Nitrogen to Creatinine Ratio, OSA Obstructive Sleep Apnea

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