Association between preoperative platelet and 30-day postoperative mortality of adult patients undergoing craniotomy for brain tumors: data from the American College of Surgeons National Surgical Quality Improvement Program database

Table 4 The results of the standard linear and two-piecewise linear regression model

	Postoperative 30-day mortality (OR, 95% CI, P value)
Fitting model by standard linear regression	0.999 (0.997, 1.000) 0.0398
Fitting model by two-piecewise linear regression
Infection point	236
≤236	0.993 (0.990, 0.995) < 0.0001
>236	1.002 (1.000, 1.004) 0.0179
P value for log likelihood ratio test	< 0.001

The model adjusted for BMI, sex, race, age range, bleeding disorders, diabetes, dialysis, smoking status, severe COPD, preoperative transfusions, hypertension, steroid use for chronic condition, preoperative systemic sepsis, operation time, emergency case, serum Na, BUN, Cr, WBC count, and HCT count
Ref reference; OR odds ratios; CI confidence

ISSN: 1471-2377