Relationship between Preoperative Hemoglobin and Hospital Stays in Patients Receiving Prime Total Knee Arthroplasty

Table 3

Threshold effect analysis between hemoglobin and length of stay for exposure: HB.

Outcome	Length of stay	value
Inflection point (K)	14
<K piecewise 1	−0.24 (0.36, 0.12)	<0.0001
>K piecewise 2	0.15 (0.12, 0.41)	0.2771
Log-likelihood ratio test		0.020

Data in the table: β (95% CI) value/OR (95% CI) value.