Fig 5. The distribution of reviewer estimated pregnancy start difference in days from the algorithm start (< -14, -8 thru -14, -1 thru -7, 0, 1 through 7, 8 through 14 and > 14 days) in the Optum database, stratified by pregnancy outcome (all outcomes, live birth, abortion, ectopic pregnancy, and stillbirth) and method used for pregnancy start estimation.

Legend for start estimation methods referenced in row panels:

LMP = last menstrual period

GEST = gestational age record

INFERT = fertility procedure

ULS = nuchal ultrasound

AFP = alpha-fetoprotein test

AMEN = amenorrhea record

URINE = urine pregnancy record

AVG = average gestational age estimate

ALL = all start estimation methods combined

*If percentages do not add up to 100%, reviewer indicated difference in days from the algorithm could not be determined.