missing birth info?

[kachergis]

For American English, calling get_administration_data() with include_birth_info=T does not return any non-NA values for any of the relevant variables...don't some of these data have non-NA birth information? (e.g. the norms data, minimally?) Are the datasets not read in correctly, or is there an issue in get_administration_data()? Here's an example:

require(wordbankr)
ws_dat <- get_administration_data(language="English (American)", 
                                  form="WS", include_demographic_info = T, 
                                  include_birth_info = T,
                                  include_language_exposure = T)
wg_dat <- get_administration_data(language="English (American)", 
                                  form="WG", include_demographic_info = T,
                                  include_birth_info = T,
                                  include_language_exposure = T)
# include_study_internal_id = T

table(wg_dat$born_early_or_late) # < table of extent 0 >
table(wg_dat$gestational_age) # < table of extent 0 >
table(wg_dat$birth_weight) # < table of extent 0 >
table(wg_dat$zygosity) # < table of extent 0 >

table(ws_dat$born_early_or_late) # < table of extent 0 >
table(ws_dat$gestational_age) # < table of extent 0 >
table(ws_dat$birth_weight) # < table of extent 0 >
table(ws_dat$zygosity) # < table of extent 0 >