Table 4 Nonlinearity of preoperative pH and deep vein thrombosis.

From: The admission pH is a risk factor of preoperative deep vein thrombosis in geriatric hip fracture: a retrospective cohort study

Outcome:

OR (95%CI) P value

Fitting model by stand linear regression

1.54 (1.09, 2.17) 0.0144

Fitting model by two-piecewise linear regression

 

Inflection point

7.39

 < 7.39

19.47 (1.45, 260.91) 0.0249

 > 7.39

1.26 (0.85, 1.86) 0.2561

P for log-likelihood ratio test

0.028

  1. Adjusted for sex, fracture classification, multiple injuries, time to operation, dementia, gastritis and activated partial thromboplastin time.
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