Difference between revisions of "Infant's dioxin exposure"

# This is code Op_en7797/ on page [[Infant's dioxin exposure]]

library(OpasnetUtils)

objects.latest("Op_en7797", code_name="initiate")

exposure <- Ovariable("exposure", data = data.frame(Exposure_agent = "TEQ", Result = 100))

dx.expo.child <- EvalOutput(dx.expo.child)

oprint(summary(dx.expo.child))

# This is code Op_en7797/initiate on page [[Infant's dioxin exposure]]

library(OpasnetUtils)

################## CREATE a separate ovarible about children's exposure: expo.child
# Convert mother's dioxin intake (pg/d) into child's dioxin concentration (pg/g) in fat after 6 months of breast-feeding.
# For details, see [[ERF of dioxin#Dental defects]]

a <- opbase.data("Op_en7797", subset = "Parametres") # [[Infant's dioxin exposure]]

t0.5	<- Ovariable("t0.5", data = a[a$Parametre == "TEQ half-life" , ][-(1:2)])
f_ing	<- Ovariable("f_ing", data = a[a$Parametre == "TEQ fraction absorbed" , ][-(1:2)])
f_mtoc	<- Ovariable("f_mtoc", data = a[a$Parametre == "TEQ fraction to child" , ][-(1:2)])
BF	<- Ovariable("BF", data = a[a$Parametre == "Body fat in infant" , ][-(1:2)])

dx.expo.child <- Ovariable(
  "dx.expo.child",
  dependencies = data.frame(
    Name = c(
      "exposure", # Mother's exposure to dioxin (pg/d)
      "t0.5", # Half-life of dioxin in mother (d)
      "f_ing", # Fraction of dioxin ingested by mother that is actually absorbed
      "f_mtoc", # Fraction of mother's dioxin body burden that enters the child during 6 mo breast feeding.
      "BF" # Body fat amount (g) in the infant at 6 mo of age
    )
  ),
  formula = function(...) {
    out <- exposure * f_ing * t0.5 / log(2) # Body burden in mother after long constant exposure
    out <- out * f_mtoc / BF # Dioxin concentration in child
    out <- log(out + 0.1) # Convert to logarithm for ERF compatibility (avoid log(0))

    # Technical conversion
    out <- out[out$Exposure_agent == "TEQ" , ]
    out$Exposure_agent <- "logTEQ"
    return(out)
  }
)

objects.store(t0.5, f_ing, f_mtoc, BF, dx.expo.child)
cat("Ovariables t0.5, f_ing, f_toc, BF, dx.expo.child stored.\n")