Wildschut et al., "First-trimester crown-rump
length and embryonic volume of aneuploid fetuses measured in virtual reality," Ultrasound in Obstetrics and Gynecology, vol.
When a yolk sac and embryo were visible but a fetal heartbeat was not apparent, the false-positive rate for miscarriage was 8.3% with a crown-rump
length cutoff of 5 mm.
In the case of adiponectin, regression analysis demonstrated that the serum concentration was significantly affected by maternal age, weight, cigarette smoking status, and racial origin but not method of conception (P = 0.637), parity (P = 0.219), or fetal crown-rump
length (P = 0.459), as expressed in the following regression equation: square-root adiponectin expected = 130.19 + 0.74 x maternal age in years + (-18.24 if the racial origin was African, -31.89 if South Asian, 0 if Caucasian, East Asian, or mixed) -0.53 x maternal weight in kg -10.38 if cigarette smoker ([R.sup.2] = 0.223, P < 0.0001).
A critical evaluation of sonar "crown-rump
First-trimester screening characteristics Screen negative Variable N=356 Range Age of patient (yrs) 30.1 18233 Gestational age (wks.d) 13.2 11.1-14.0 Crown-rump
length (mm) 69.4 65-84 Fetal heart rate (beats/min) 164 146-180 Nuchal translucency (mm) 1.8 1.0-2.5 Correct recall of LNMP (%) 46 Screen positive Variable N=59 Range p-value Age of patient (yrs) 31 23-43 0.466 Gestational age (wks.d) 12.5 11.2-13.6 <0.01 Crown-rump
length (mm) 64.7 47.0-83.2 0.01 Fetal heart rate (beats/min) 170 147-185 0.34 Nuchal translucency (mm) 3.65 1.7-9.6 <0.01 Correct recall of LNMP (%) 23 <0.01 LNMP = last normal menstrual period.
One of the females, which weighed 68.9 g, was carrying a single embryo measuring 30 mm in crown-rump
Statistical tests used were analysis of variance (ANOVA) for litter size, analysis of covariance (ANCOVA) using litter size as a covariate for newborn weight and crown-rump
length, implantation sites, and resorptions, and repeated-measures ANCOVA for weight changes during pregnancy, where weight of the mother at GD6, 9, 12, 15, and 18 was the repeated measure and weight at GDO was the covariate.
Morphologic trait N = 118[dagger] N = 118[double dagger] Thigh length -0.161 -0.106 Leg length -0.166 -0.142 Upper arm length -0.208(*) -0.062 Forearm length -0.207(*) -0.059 Biiliocristal diameter -0.156 -0.143 Bitrochanteric diameter -0.134 -0.086 Transverse chest diameter -0.222(*) -0.031 Chest depth -0.123 -0.157 Biacromial diameter -0.186(*) -0.106 Head length -0.135 -0.103 Head breadth -0.027 -0.007 Chest circumference -0.150 -0.107 Upper arm circumference -0.120 -0.091 Calf circumference -0.205(*) -0.114 Biocular breadth -0.212(*) -0.235(*) Bizygomatic breadth -0.142 -0.097 Bigonial breadth -0.140 -0.089 Upper face height -0.157 -0.056 Trunk length -0.154 -0.101 Crown-rump
length -0.156 -0.112 * Indicates significant at P [less than] 0.05 without sequential Bonferroni.
Selbing A: The pregnant population and a fetal crown-rump
length screening program, Acta Obstet Gynecol Scand 1983; 62:161-164
The volume of the myocardium (variable Y, in cubic millimeters) was correlated to embryonic crown-rump
length (CRL, variable X, in millimeters) and age (in days).
Endovaginal US: demonstration of cardiac activity in embryos of less than 5.0 mm in crown-rump
The number of male and female fetuses was counted; for each fetus, the placenta and body weight were recorded, and fetal crown-rump
length was measured.