Universities and community colleges normally offer non-credit or continuing adult education classes on a semester, trimester, or quarterly basis and usually send out the next session's schedule prior to its start.
Maternal age at delivery was reported in MBRN and gestational age was calculated from expected date of delivery on the basis of first trimester ultrasound.
Further, a single 48-hr prenatal monitoring during the second or third trimester was used as a basis for estimating exposure.
Four additional women were retrospectively diagnosed with a primary CMV infection acquired in the first trimester of gestation on the basis of CMV-specific IgM and IgG of low avidity (Fig. 3).
Spearman's correlations between pairs of markers were computed for each trimester and additionally, on the basis of de-trended residuals, by subtracting the ordinary least squares fitted mean from all observations, and then averaging over a four-week moving window with a step width of one week.
To compare first-trimester versus second-trimester screening procedures on a common basis, we used a fixed detection rate, which is more applicable than a fixed false-positive rate because applying the latter to the first-trimester as compared with the second-trimester results in a different detection rate, notably from the spontaneous losses of DS foetuses between the first and second trimesters.
Chorionicity was determined on the basis of first-trimester ultrasound assessment and/or postpartum pathological examination of placentas and intertwin membranes.
Gestational age was calculated on the basis of first-trimester ultrasound in 98.2% of MoBa participants.
In Sweden, most foetuses are scanned on a routine basis in the second trimester and further scans are generally performed by indication.
Over a period of 22 months, we made efforts to identify and recruit unselected women living in SST and Town II who were in the last trimester of their pregnancy (on the basis of the accounts of their gestation that women had received from the antenatal clinic).
