Association between Body Mass Index and Short-Term Clinical Outcomes in Critically Ill Patients with Sepsis: A Real-World Study

Table 3

Threshold effect analysis of BMI and 28-day mortality.

Outcome: 28-year mortality
Inflection point	HR	95% CI	value
<38.68 kg/m^2	0.97	0.96-0.98	<0.0001
≥38.68 kg/m^2	1.05	1.03-1.08	<0.0001
The log-likelihood ratio test:
The confidence interval of the inflection point: 26.49–40.99 kg/m^2

A two-piecewise linear regression model and a log-likelihood ratio test were used to explore for the presence of a threshold effect of 28-day mortality, and inflection points are shown using threshold effect analysis, with confidence interval of the inflection point calculated by the bootstrap method. Note: adjusted by age, sex, SOFA, mechanical ventilation on the first day, renal replacement therapy on the first day, congestive heart failure, cardiac arrhythmias, valvular disease, peripheral vascular disease, hypertension, other neurological diseases, chronic pulmonary disease, liver disease, renal failure, AIDS, lymphoma, metastatic cancer, solid tumor, diabetes, fluid and electrolyte disorders, alcohol abuse, drug abuse, and depression. Abbreviations: BMI—body mass index; HR—hazard ratio; CI—confidence interval.