diff --git a/analysis/07_read_wwarn_pd.R b/analysis/07_read_wwarn_pd.R
index 37e5a12..b8c100b 100644
--- a/analysis/07_read_wwarn_pd.R
+++ b/analysis/07_read_wwarn_pd.R
@@ -85,6 +85,16 @@ wwarn_pd <- wwarn_pd |>
 wwarn_pd <- wwarn_pd |>
   mutate(site = ifelse(is.na(site), country, site))
 
+# replace study_end with study_start if NA
+wwarn_pd <- wwarn_pd |>
+  mutate(study_end = ifelse(is.na(study_end), study_start, study_end))
+
+# correct some mistakes in dates
+wwarn_pd <- wwarn_pd |>
+  mutate(study_start = ifelse(PMID == 19236701, 2003, study_start),
+         study_end = ifelse(PMID == 19236701, 2006, study_end)) |>
+  mutate(study_start = ifelse(PMID == 27646822, 2013, study_start))
+
 # make study and survey IDs
 wwarn_pd <- wwarn_pd |>
   left_join(data.frame(site = unique(wwarn_pd$site)) |>
diff --git a/analysis/08_merge_wwarn.R b/analysis/08_merge_wwarn.R
index 2114e24..d10e64c 100644
--- a/analysis/08_merge_wwarn.R
+++ b/analysis/08_merge_wwarn.R
@@ -35,13 +35,14 @@ wwarn_combined <- wwarn_k13 |>
   mutate(study_start = year,
          study_end = year) |>
   select(-year) |>
-  bind_rows(wwarn_pd)
+  bind_rows(wwarn_pd) |>
+  filter(tested != 0)
 
 # ------------------------------------------------------------------------
 # make STAVE objects
 
 # study-level data frame
-df_studies <- wwarn_k13 |>
+df_studies <- wwarn_combined |>
   group_by(study_id) |>
   summarise(study_label = study_name[1],
             contributors = authors[1],
@@ -55,16 +56,16 @@ df_studies <- wwarn_k13 |>
   select(study_id, study_label, description, access_level, contributors, reference, reference_year, PMID)
 
 # survey-level data frame
-df_surveys <- wwarn_k13 |>
-  group_by(study_id, survey_id, country, site, year) |>
+df_surveys <- wwarn_combined |>
+  group_by(study_id, survey_id, country, site, study_start, study_end) |>
   summarise(latitude = lat[1],
             longitude = lon[1],
             .groups = "drop") |>
   mutate(location_method = "WWARN coordinates",
          location_notes = NA,
-         collection_start = as.Date(sprintf("%s-01-01", year)),
-         collection_end = as.Date(sprintf("%s-12-31", year)),
-         collection_day = as.Date(sprintf("%s-07-01", year)),
+         collection_start = as.Date(sprintf("%s-01-01", study_start)),
+         collection_end = as.Date(sprintf("%s-12-31", study_end)),
+         collection_day = collection_start + (collection_end - collection_start) / 2,
          time_method = "Midpoint of WWARN recorded year",
          time_notes = NA) |>
   rename(country_name = country,
@@ -73,7 +74,7 @@ df_surveys <- wwarn_k13 |>
          collection_start, collection_end, collection_day, time_method, time_notes)
 
 # counts-level data frame
-df_counts <- wwarn_k13 |>
+df_counts <- wwarn_combined |>
   select(study_id, survey_id, variant_string, variant_num = present, total_num = tested, notes)
 
 # make STAVE object and append data
diff --git a/analysis/11_merge_stave.R b/analysis/11_merge_stave.R
index 6aec9e5..24e19b9 100644
--- a/analysis/11_merge_stave.R
+++ b/analysis/11_merge_stave.R
@@ -87,7 +87,7 @@ l[[22]] <- s$get_prevalence("crt:76:T") |>
          collection_year = year(collection_day))
 l[[23]] <- s$get_prevalence("mdr1:86:Y") |>
   select(survey_id, collection_day, denominator) |>
-  mutate(target_variant = "crt:86:Y",
+  mutate(target_variant = "mdr1:86:Y",
          collection_year = year(collection_day))
 
 df_l <- bind_rows(l)
@@ -99,3 +99,24 @@ df_comb <- df_l |>
 
 # get total samples sequenced at any of our positions of interest
 sum(df_comb$denom_max)
+
+# get the equivalent number for k13 only
+bind_rows(l[1:21]) |>
+  group_by(survey_id, collection_year) |>
+  summarise(denom_max = max(denominator)) |>
+  pull(denom_max) |>
+  sum()
+
+# get the equivalent number for crt only
+bind_rows(l[22]) |>
+  group_by(survey_id, collection_year) |>
+  summarise(denom_max = max(denominator)) |>
+  pull(denom_max) |>
+  sum()
+
+# get the equivalent number for mdr1 only
+bind_rows(l[23]) |>
+  group_by(survey_id, collection_year) |>
+  summarise(denom_max = max(denominator)) |>
+  pull(denom_max) |>
+  sum()
diff --git a/analysis/data-derived/WWARN_STAVE.rds b/analysis/data-derived/WWARN_STAVE.rds
index 1bed3c1..26d7d6a 100644
Binary files a/analysis/data-derived/WWARN_STAVE.rds and b/analysis/data-derived/WWARN_STAVE.rds differ
diff --git a/analysis/data-derived/wwarn_pd_clean.rds b/analysis/data-derived/wwarn_pd_clean.rds
index 6835034..137d6e7 100644
Binary files a/analysis/data-derived/wwarn_pd_clean.rds and b/analysis/data-derived/wwarn_pd_clean.rds differ
diff --git a/analysis/data-out/stave_data_2025.12.19.rds b/analysis/data-out/stave_data_2025.12.19.rds
index 48fc6bf..1fd7582 100644
Binary files a/analysis/data-out/stave_data_2025.12.19.rds and b/analysis/data-out/stave_data_2025.12.19.rds differ
diff --git a/analysis/data-raw/PMID_pd_replace.xlsx b/analysis/data-raw/PMID_pd_replace.xlsx
index bff208a..8be4508 100644
Binary files a/analysis/data-raw/PMID_pd_replace.xlsx and b/analysis/data-raw/PMID_pd_replace.xlsx differ