ALGAE Data Dictionary: Early life exposures, using birth address assessment (algae3400-algae3442)

An automated protocol for assigning early life exposures to longitudinal cohort studies

ALGAE Data Dictionary: Early life exposures, using birth address assessment (algae3400-algae3442)

by Kevin Garwood

Context of Variables

These early life exposure values are based on using the birth address assessment. For each study member, cumulative, average and median exposures are assessed based on two factors:

For each life stage, the protocol counts the number of days which can be described by the following categories for data quality:

Please see the Assess the Data Quality of Each Daily Exposure Value section of the ALGAE methodology to learn more about these data quality categories.

Variables marked _err aggregate daily exposure errors for a given pollutant and life stage.

Location of Result File

You will find these variables in a file having a name that fits the form:
res_early_no_mob_birth_addr_exp_[Date stamp].csv
which will be found in the directory:
early_life/results/exposure_data/no_mobility_birth_address
or
later_life/results/exposure_data/no_mobility_birth_address

Example Result File

See here.

Variable Naming Conventions

It may be quicker to understand the variables through naming conventions rather than looking at specific table entries. The basic format of variables in this section follows this pattern:
	algae34[00-16]_[pollution type]_[aggregate value]

In this pattern:

  • algae34: indicates that they are based on the locations study members occupied at birth, and that they ignore all other locations they may have occupied.
  • pollution_type: will be name, nox_rd, pm10_tot, pm10_rd, pm10_gr
  • aggregate value: sum for cumulative value, avg for average value and med for median value.

The pollutant codes have the following meanings:

  • name: high level pollution that comes from outside the exposure area
  • nox_rd: Nitrogen oxide pollution coming from roads
  • pm10_rd: PM10 particulate matter coming from roads.
  • pm10_gr: PM10 particulate matter coming from sources other than roads.
  • pm10_tot: PM10 particulate matter coming from either roads or other sources.

Variable Dictionary

Variable Description
algae3400_person_id An anonymised or pseudonymised identifier which represents a study member. ALGAE uses this variable to link data together for a given study member.
algae3401_life_stage The name of a life stage. For example, "T1" may be the name of the Trimester 1 life stage.
algae3402_life_stage_duration The number of days in the life stage.
algae3403_name_inv_addr_days The number of NAME exposure days in the life stage that the study member spent at an invalid address. See definition of Invalid address days.
algae3404_name_oob_days The number of NAME exposure days in the life stage that the study member spent living at a location that is considered outside the bounds of the exposure area. See definition of Out of bounds days.
algae3405_name_poor_addr_days The number of NAME exposure days in the life stage that the study member spent living at a location whose geocode was derived from a poor quality residential address. The geocode was used to generate exposure values, but it is still considered to be invalid because it is of such poor quality. See definition of Poor address days.
algae3406_name_missing_exp_days The number of NAME exposure days in the life stage that the study member spent living at a valid geocode which has some exposure values but not for specific days. See definition of Missing exposure days.
algae3407_name_good_addr_days The number of NAME exposure days in the life stage that the study member spent living at a geocode that is considered a good match: it has a valid geocode and it has a non-blank exposure value for a given day. See definition of Good address days.
algae3408_nox_rd_inv_addr_days The number of NOX RD exposure days in the life stage that the study member spent at an invalid address. See definition of Invalid address days.
algae3409_nox_rd_oob_days The number of NOX RD exposure days in the life stage that the study member spent living at a location that is considered outside the bounds of the exposure area. See definition of Out of bounds days.
algae3410_nox_rd_poor_addr_days The number of NOX RD exposure days in the life stage that the study member spent living at a location whose geocode was derived from a poor quality residential address. The geocode was used to generate exposure values, but it is still considered to be invalid because it is of such poor quality. See definition of Poor address days.
algae3411_nox_rd_missing_exp_days The number of NOX RD exposure days in the life stage that the study member spent living at a valid geocode which has some exposure values but not for specific days. See definition of Missing exposure days.
algae3412_nox_rd_good_addr_days The number of NOX RD exposure days in the life stage that the study member spent living at a geocode that is considered a good match: it has a valid geocode and it has a non-blank exposure value for a given day. See definition of Good address days.
algae3413_pm10_rd_inv_addr_days The number of PM10 RD exposure days in the life stage that the study member spent at an invalid address. See definition of Invalid address days.
algae3414_pm10_rd_oob_days The number of PM10 RD exposure days in the life stage that the study member spent living at a location that is considered outside the bounds of the exposure area. See definition of Out of bounds days.
algae3415_pm10_rd_poor_addr_days The number of PM10 RD exposure days in the life stage that the study member spent living at a location whose geocode was derived from a poor quality residential address. The geocode was used to generate exposure values, but it is still considered to be invalid because it is of such poor quality. See definition of Poor address days.
algae3416_pm10_rd_missing_exp_days The number of PM10 RD exposure days in the life stage that the study member spent living at a valid geocode which has some exposure values but not for specific days. See definition of Missing exposure days.
algae3417_pm10_rd_good_addr_days The number of PM10 RD exposure days in the life stage that the study member spent living at a geocode that is considered a good match: it has a valid geocode and it has a non-blank exposure value for a given day. See definition of Good address days.
algae3418_pm10_gr_inv_addr_days The number of PM10 GR exposure days in the life stage that the study member spent at an invalid address. See definition of Invalid address days.
algae3419_pm10_gr_oob_days The number of PM10 GR exposure days in the life stage that the study member spent living at a location that is considered outside the bounds of the exposure area. See definition of Out of bounds days.
algae3420_pm10_gr_poor_addr_days The number of PM10 GR exposure days in the life stage that the study member spent living at a location whose geocode was derived from a poor quality residential address. The geocode was used to generate exposure values, but it is still considered to be invalid because it is of such poor quality. See definition of Poor address days.
algae3421_pm10_gr_missing_exp_days The number of PM10 GR exposure days in the life stage that the study member spent living at a valid geocode which has some exposure values but not for specific days. See definition of Missing exposure days.
algae3422_pm10_gr_good_addr_days The number of PM10 GR exposure days in the life stage that the study member spent living at a geocode that is considered a good match: it has a valid geocode and it has a non-blank exposure value for a given day. See definition of Good address days.
algae3423_pm10_tot_inv_addr_days The number of PM10 TOT exposure days in the life stage that the study member spent at an invalid address. See definition of Invalid address days.
algae3424_pm10_tot_oob_days The number of PM10 TOT exposure days in the life stage that the study member spent living at a location that is considered outside the bounds of the exposure area. See definition of Out of bounds days.
algae3425_pm10_tot_poor_addr_days The number of PM10 TOT exposure days in the life stage that the study member spent living at a location whose geocode was derived from a poor quality residential address. The geocode was used to generate exposure values, but it is still considered to be invalid because it is of such poor quality. See definition of Poor address days.
algae3426_pm10_tot_missing_exp_days The number of PM10 TOT exposure days in the life stage that the study member spent living at a valid geocode which has some exposure values but not for specific days. See definition of Missing exposure days.
algae3427_pm10_tot_good_addr_days The number of PM10 TOT exposure days in the life stage that the study member spent living at a geocode that is considered a good match: it has a valid geocode and it has a non-blank exposure value for a given day. See definition of Good address days.
algae3428_name_sum Cumulative exposure of NAME for the given life_stage.
algae3429_name_avg Average exposure for NAME measured for the given life_stage
algae3430_name_med Median exposure for NAME measured for the given life_stage
algae3431_nox_rd_sum Cumulative exposure of NOX (road sources) for a given life_stage.
algae3432_nox_rd_avg Average exposure of NOX (road sources) for a given life_stage.
algae3433_nox_rd_med Median exposure for NOX (road sources), measured for the given life_stage
algae3434_pm10_gr_sum Cumulative exposure for PM10 (non-road sources), measured for the given life_stage
algae3435_pm10_gr_avg Average exposure for PM10 (non-road sources), measured for the given life_stage
algae3436_pm10_gr_med Median exposure for PM10 (non-road sources), measured for the given life_stage
algae3437_pm10_rd_sum Cumulative exposure for PM10 (road sources), measured for the given life_stage
algae3438_pm10_rd_avg Average exposure for PM10 (road sources), measured for the given life_stage
algae3439_pm10_rd_med Median exposure for PM10 (road sources), measured for the given life_stage
algae3440_pm10_tot_sum Cumulative exposure for PM10 (all sources), measured for the given life_stage
algae3441_pm10_tot_avg Average exposure for PM10 (all sources), measured for the given life_stage
algae3442_pm10_tot_med Median exposure for PM10 (all sources), measured for the given life_stage