Table 4.

Threshold effect analysis of PLR on 30-day all-cause mortality in rheumatic heart disease patients.

30-day mortality	HR (95% CI)	p-value
Fitting by the standard linear regression	2.59 (2.05,3.27)	<0.001
Fitting model by two-piecewise linear regression
Inflection point	4.52
Log PLR < 4.52	8.64 (1.05,99.45)	0.047
Log PLR ≥ 4.52	2.35 (1.69,3.26)	<0.001
p for Log-likelihood ratio		0.366

CI, confidence Interval; HR, hazard ratio; PLR, platelet-to-lymphocyte ratio.