Assertion: oral thc | /r/CapableOf | use both a binary covariate
Facets:
Source sentences:
text: We then fit three logistic regression models of the positivity in blood THC on oral fluid THC, which was included in the model using both a binary covariate (> 0 ng/ml vs. = 0 ng/ml) and the natural-log of the continuous THC concentration.