Preterm or not--an evaluation of estimates of gestational age in a cohort of women from Rural Papua New Guinea.

Unlike the clinical and ultrasound measures in Table 4 , the LMP/SFH regression model had a negative trend in the bias as shown in the Bland-Altman plot ( S3 Fig ), with a mean bias of 0 and 95% limits of agreement of (-17, 17) leading to a reduced sensitivity but increased specificity to predict PTB and a better overall performance as determined by the F-measure.

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