Calculate child's age in months — get_age

Calculate child's age in months based on the date of birth and the date of data collection.

Usage

get_age_months(dos, dob)

Arguments

dos: A Date vector of date of data collection.
dob: A Date vector of the child's date of birth.

Value

A numeric vector of child's age in months. Any value less than 6.0 and greater than or equal to 60.0 months are set to NA.

Examples

## Take two vectors of class "Date" ----
surv_date <- as.Date(
  c(
    "2024-01-05", "2024-01-05", "2024-01-05", "2024-01-08", "2024-01-08",
    "2024-01-08", "2024-01-10", "2024-01-10", "2024-01-10", "2024-01-11"
  )
)
bir_date <- as.Date(
  c(
    "2022-04-04", "2021-05-01", "2023-05-24", "2017-12-12", NA,
    "2020-12-12", "2022-04-04", "2021-05-01", "2023-05-24", "2020-12-12"
  )
)

## Apply the function ----
get_age_months(
  dos = surv_date,
  dob = bir_date
)
#>  [1] 21.059548 32.164271  7.425051        NA        NA 36.862423 21.223819
#>  [8] 32.328542  7.589322 36.960986