The phrase "age from date" is not correct and does not convey a clear meaning in written English.
It may be intended to refer to calculating age based on a specific date, but the phrasing is awkward and unclear.
Example: "To determine the age from date of birth, subtract the birth year from the current year."
Alternatives: "age as of date" or "age calculated from date".
The process is automatic and includes: conversion of data from XML format to SAS format, correction of integrated data where necessary (zip code) and calculation of complementary variables (age from date of birth).
The transmission step included: time needed for data transmission from hospital to InVS through regional level which gathered all local ED data sets, the time taken by data processing (transcription data from XML format to SAS format, correction of integrated date if necessary or calculation of complementary variables, like age from date of birth).
From this information, we calculated age from date of birth and number of person years in study.
Mothers completed the child section of the socio-demographic questionnaire (SDQ) which captured information on the following child variables: age (from date of birth), sex, number of hours in child care per week in own home and/or outside own home and total number of hours in child care per week.
The onset of pregnancy was defined as the first day of the last menstrual period and was estimated by subtraction of gestational age from the date of birth or the date of abortive outcome.
Age: calculated from date of birth.
Age (derived from date of birth) and current weeks of pregnancy as reported by respondents, were both continuous variables.
24 Date of conception was estimated by subtracting gestational age from the date of birth.
The estimated date of conception was calculated by subtracting the gestational age from the date of birth.
The first day of the last menstrual period was estimated by subtracting gestational age from the date of pregnancy termination.
We calculated gestational age from the date of the last menstrual period (LMP) reported at recruitment and confirmed using estimates based on ultrasound examination in the 12th week of gestation.
