R/data.R

In hoehleatsu/trisomy21risk: Risk Calculation for T21 from a First Trimester Combined Test

  #' Background risk for trisomy 21 (Down syndrome)
#'
#' A dataset containing the background odds for trisomy 21 (Down syndrome) as a 
#' function of maternal age and gestational age. The data originate from Table 4
#' of Snijders et al. (1999).
#' 
#' @format A data frame with 18 rows and 7 variables:
#' \describe{
#'   \item{Age}{Maternal age in years}
#'   \item{W10}{Odds for T21 in the form $1:x$ at a gestational age of 10 weeks.}
#'   \item{W12}{Odds for T21 in the form $1:x$ at a gestational age of 12 weeks.}
#'   \item{W14}{Odds for T21 in the form $1:x$ at a gestational age of 14 weeks.}
#'   \item{W16}{Odds for T21 in the form $1:x$ at a gestational age of 16 weeks.}
#'   \item{W20}{Odds for T21 in the form $1:x$ at a gestational age of 20 weeks.}
#'   \item{W40}{Odds for T21 in the form $1:x$ at a gestational age of 40 weeks.}
#' }
#' @source Snijders, R. J., K. Sundberg, W. Holzgreve, G. Henry, and K. H. Nicolaides. 1999. “Maternal age- and gestation-specific risk for trisomy 21.” Ultrasound Obstet Gynecol 13 (3): 167–70.
"snijders_etal1999_t21"