| Title: | Percentile Estimation of Fetal Weight for Twins by Chorionicity |
|---|---|
| Description: | Package to Percentile estimation of fetal weight for twins by chorionicity (dichorionic-diamniotic or monochorionic-diamniotic). |
| Authors: | Rocio Aznar [aut], Luis Mariano Esteban [aut, cre], Gerardo Sanz [aut], Ricardo Saviron [aut] |
| Maintainer: | Luis Mariano Esteban <[email protected]> |
| License: | GPL-3 |
| Version: | 0.1.1 |
| Built: | 2025-03-01 05:06:01 UTC |
| Source: | https://github.com/cran/PTwins |
The PTwins function estimates the fetus weight percentile using a multilevel linear model developed from a Spanish twin cohort.
PTwins(weight,week,day=3,dichorionic=TRUE)PTwins(weight,week,day=3,dichorionic=TRUE)
weight |
The fetus weight estimated by ultrasound at a gestational age (weeks) using Hadlock formula: log10(FW)=1.3596-0.00386(AC)x(FL)+0.0064(HC)+0.0006(BPD)x(AC)+ 0.0424(AC)+0.174(FL) FW: fetal weight, AC: abdominal circumference, FL: femur lenght, HC: head circumference, BPD: biparital diameter |
week |
The gestational age in weeks for which the Fetus weight where estimated |
day |
The exact day in the gestational week at which the fetus weight were estimated. For the percentile calculation, if we choose for example: week=23, day=2, this is equivalent to 163 days of GA |
dichorionic |
This parameter indicates if the fetus is dichorionic-diamniotic (dichorionic=TRUE) or monochorionic-monoamniotic (dichorionic=FALSE) |
The inputs weight, week, day or dichorionic can be a number or a vector to include several cases
The returned fit object of PTwins contains the following components.
Percentile |
Percentile of the fetus weight |
weight |
fetus weight |
GA |
Gestational age in exact weeks |
Rocio Aznar, Luis Mariano Esteban, Gerardo Sanz, Ricardo Saviron
#Percentile estimation of a dichorionic-diamniotic fetus of 2300 grams #of weight estimated at the 22nd week (+2 days) of gestational age. PTwins(weight=2300,week=22,day=2,dichorionic=TRUE) #Percentile estimation of a monochorionic-diamniotic fetus of 2300 grams #of weight estimated at the 22nd week (+2 days) of gestational age. PTwins(weight=2300,week=22,day=2,dichorionic=FALSE) #Percentile estimation of a dataframe that includes 10 cases WEIGHT<-round(rnorm(10,2100,125),digits=0) WEEK<-sample(seq(18,36),10) DAY<-sample(seq(0,7),10,replace=TRUE) dichorionic<-sample(c("TRUE","FALSE"),10,replace=TRUE) DT<-data.frame(WEIGHT,WEEK,DAY,dichorionic) PTwins(weight=DT$WEIGHT,week=DT$WEEK,day=DT$DAY,dichorionic=DT$dichorionic)#Percentile estimation of a dichorionic-diamniotic fetus of 2300 grams #of weight estimated at the 22nd week (+2 days) of gestational age. PTwins(weight=2300,week=22,day=2,dichorionic=TRUE) #Percentile estimation of a monochorionic-diamniotic fetus of 2300 grams #of weight estimated at the 22nd week (+2 days) of gestational age. PTwins(weight=2300,week=22,day=2,dichorionic=FALSE) #Percentile estimation of a dataframe that includes 10 cases WEIGHT<-round(rnorm(10,2100,125),digits=0) WEEK<-sample(seq(18,36),10) DAY<-sample(seq(0,7),10,replace=TRUE) dichorionic<-sample(c("TRUE","FALSE"),10,replace=TRUE) DT<-data.frame(WEIGHT,WEEK,DAY,dichorionic) PTwins(weight=DT$WEIGHT,week=DT$WEEK,day=DT$DAY,dichorionic=DT$dichorionic)