Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
ROC curve of the best predictive model for the second trimester cohort. The model was trained with NIR spectra (R3, 5100–4000 cm−1) from second trimester serum samples after pretreatment by first derivative (width = 15) and mean centering. The average and the individual curves of 50 DCV repetitions are colored in black and gray, respectively. ROC: receiver operating characteristic; NIR: near-infrared; R3: Range 3; DCV: double cross-validation.
