Query to add the number of days of prior observation in the current observation period at a certain date

`r lifecycle::badge("experimental")` Same as `addPriorObservation()`, except query is not computed to a table.

Usage

addPriorObservationQuery(
  x,
  indexDate = "cohort_start_date",
  priorObservationName = "prior_observation",
  priorObservationType = "days"
)

Arguments

x

Table with individuals in the cdm.

indexDate

Variable in x that contains the date to compute the prior observation.

priorObservationName

name of the new column to be added.

priorObservationType

Whether to return a "date" or the number of "days".

Value

cohort table with added column containing prior observation of the individuals.

Examples

# \donttest{
cdm <- mockPatientProfiles()

cdm$cohort1 |>
  addPriorObservationQuery()
#> # Source:   SQL [?? x 5]
#> # Database: DuckDB v1.3.1 [unknown@Linux 6.11.0-1015-azure:R 4.5.1/:memory:]
#>    cohort_definition_id subject_id cohort_start_date cohort_end_date
#>                   <int>      <int> <date>            <date>         
#>  1                    1          4 1988-07-02        1988-07-15     
#>  2                    1          7 1986-01-19        1995-05-19     
#>  3                    3          8 1955-12-28        1956-08-19     
#>  4                    2          1 1958-01-08        1961-06-04     
#>  5                    2         10 1935-02-08        1940-12-14     
#>  6                    1          5 1994-04-17        2012-05-29     
#>  7                    3          6 1917-11-19        1919-09-11     
#>  8                    2          3 1944-03-02        1944-06-22     
#>  9                    2          2 1911-07-06        1954-07-06     
#> 10                    3          9 2004-06-11        2012-02-06     
#> # ℹ 1 more variable: prior_observation <int>

mockDisconnect(cdm = cdm)
# }