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. Author manuscript; available in PMC: 2016 Feb 4.
Published in final edited form as: Paediatr Perinat Epidemiol. 2013 Oct 10;28(1):3–10. doi: 10.1111/ppe.12083

Figure 2.

Figure 2

Sensitivity and positive predictive value of obstetric estimate of gestational age by week using early ultrasound as the criterion standard: California Statewide Expanded Alpha Fetoprotein Prenatal Screening Program, April–31 December 2007, n = 164 158.