feat: #2484 Updated CHG/PCHG comments and restrict_derivation call to…

… notify that as per ADaM IG, the decision on how to populate pre-baseline and baseline values of CHG/PCHG is left to producer choice.

inst/templates/ad_adeg.R

@@ -276,10 +276,18 @@ adeg <- adeg %>%
     source_var = ANRIND,
     new_var = BNRIND
   ) %>%
-  # Calculate CHG
-  derive_var_chg() %>%
-  # Calculate PCHG
-  derive_var_pchg()
+  # Calculate CHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of CHG is left to producer choice
+  restrict_derivation(
+    derivation = derive_var_chg,
+    filter = AVISITN > 0
+  ) %>%
+  # Calculate PCHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of PCHG is left to producer choice
+  restrict_derivation(
+    derivation = derive_var_pchg,
+    filter = AVISITN > 0
+  )
 
 ## ANL01FL: Flag last result within an AVISIT and ATPT for post-baseline records ----
 adeg <- adeg %>%

inst/templates/ad_adlb.R

@@ -224,11 +224,18 @@ adlb <- adlb %>%
     source_var = ANRIND,
     new_var = BNRIND
   ) %>%
-  # Calculate CHG
-  derive_var_chg() %>%
-  # Calculate PCHG
-  derive_var_pchg()
-
+  # Calculate CHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of CHG is left to producer choice
+  restrict_derivation(
+    derivation = derive_var_chg,
+    filter = AVISITN > 0
+  ) %>%
+  # Calculate PCHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of PCHG is left to producer choice
+  restrict_derivation(
+    derivation = derive_var_pchg,
+    filter = AVISITN > 0
+  )
 
 ## Calculate lab grading ----
 

inst/templates/ad_adpc.R

@@ -454,7 +454,13 @@ adpc_base <- adpc_dtype %>%
     filter = ABLFL == "Y"
   )
 
-adpc_chg <- derive_var_chg(adpc_base)
+# Calculate CHG for post-baseline records
+# The decision on how to populate pre-baseline and baseline values of CHG is left to producer choice
+adpc_chg <- restrict_derivation(
+  adpc_base,
+  derivation = derive_var_chg,
+  filter = AVISITN > 0
+)
 
 # ---- Add ASEQ ----
 

inst/templates/ad_advs.R

@@ -228,17 +228,18 @@ advs <- advs %>%
     new_var = BNRIND
   ) %>%
   # Calculate CHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of CHG is left to producer choice
   restrict_derivation(
     derivation = derive_var_chg,
     filter = AVISITN > 0
   ) %>%
   # Calculate PCHG for post-baseline records
+  # The decision on how to populate pre-baseline and baseline values of PCHG is left to producer choice
   restrict_derivation(
     derivation = derive_var_pchg,
     filter = AVISITN > 0
   )
 
-
 ## ANL01FL: Flag last result within an AVISIT and ATPT for post-baseline records ----
 advs <- advs %>%
   restrict_derivation(