chms

Accelerometer Processing Methods for Cycle 7 of the CHMS

'ActiGraph wGT3X-BT' accelerometer processing methods using the standardized workflow developed by Statistics Canada for cycle 7 of the Canadian Health Measures Survey (CHMS). The package promotes transparent and reproducible data processing while supporting the harmonization of analytical approaches among researchers wishing to align with Statistics Canada's methods. For general details about the processing methods, please consult Clarke J, Gribbon A, St-Laurent M, Ferrao T, Barnes J, Kuzik N, Colley R (2026) .

English

Overview

chms provides tools for cleaning and summarizing accelerometer data consistent with methods applied to cycle 7 of the Canadian Health Measures Survey (CHMS):

  • agd$new() initializes an R6 class with fields (data) and methods (functions) for processing Ametris (formerly ActiGraph) accelerometer data.
  • agd$run() executes a pipeline that calls several methods: $load(), $clean(), $classify() and $summarize().
  • agd$sanity_check() renders an html-formatted report of summary statistics per participant.

chms requires:

  • two ActiGraph (.agd) files per participant, one processed with the normal filter (for step counts) and the other processed with the low frequency extension filter (for all other movement behaviour variables).
  • accelerometer data at the 15-second epoch level for participants ≤ 17 years.
  • accelerometer data at the 60-second epoch level or lower for participants ≥ 18 years.
  • integer age of each participant.

By default, chms:

  • removes incomplete days of data (< 24 hours).
  • identifies sleep time, wear time and non-wear time by applying the Barreira algorithm to data at the 60-second epoch level.
  • looks for sleep bouts beginning at 6pm (3-5 years) or 7pm (6+ years).
  • identifies movement behaviours for eligible epochs (epochs previously classified as wear time and awake time) by applying the following cut-points to axis1 accelerometer counts at age-specific epoch levels:
Age (years) Epoch level (seconds) SB cut-point (counts) LPA cut-point (counts) MPA cut-point (counts) VPA cut-point (counts)
3-4 15 0-24Evenson 25-419Pate 420+Pate –
5-17 15 0-24Evenson 25-573Evenson 574-1,002Evenson 1,003+Evenson
18-64 60 0-99Troiano 100-2,019Troiano 2,020-5,998Troiano 5,999+Troiano
65+ 60 0-99Troiano 100-2,019Troiano 2,020-5,998Troiano 5,999+Troiano

SB: sedentary behaviour; LPA: light-intensity physical activity; MPA: moderate-intensity physical activity; VPA: vigorous-intensity physical activity.

  • validates days (≥ 10 hours of wear time and ≥ 100 steps). Invalid days are excluded from waking hours results.
  • validates nights of sleep (≥ 160 minutes of sleep). Invalid nights of sleep are excluded from sleeping hours results.

For more details on the methods used in the chms R package, see Clarke J, Gribbon A, St-Laurent M, Ferrao T, Barnes J, Kuzik N, Colley R. Comparison of physical activity and sedentary time measured with the ActiGraph GT3X-BT and Actical accelerometers. Health Rep. 2026 Feb 18;37(2):3-15. doi: 10.25318/82-003-x202600200001-eng. PMID: 41730515.

Installation

# Install official release (CRAN)
pak::pak("chms")

# Install development version (GitHub)
pak::pak("statcan/chms")

Usage

# Load dependencies into current R session
library(chms)
library(dplyr)

# Create participant meta (external/non-statcan users)
meta <- tibble(
  id = c("jane-canuck", "john-canuck"),
  age = c(10, 40),
  agd_lfe = c(
    system.file("extdata", "jane-canuck-lfe.agd", package = "chms"),
    system.file("extdata", "john-canuck-lfe.agd", package = "chms")
  ),
  agd_nml = c(
    system.file("extdata", "jane-canuck-nml.agd", package = "chms"),
    system.file("extdata", "john-canuck-nml.agd", package = "chms")
  ),
  start_date = c("2021-05-30", "2021-05-27"),
  epoch_length = c(15, 60)
)

# Print/examine
glimpse(meta)
#> Rows: 2
#> Columns: 6
#> $ id           <chr> "jane-canuck", "john-canuck"
#> $ age          <dbl> 10, 40
#> $ agd_lfe      <chr> "C:/Users/Clippy/AppData/Local/R/win-library/4.6/chms/ex…
#> $ agd_nml      <chr> "C:/Users/Clippy/AppData/Local/R/win-library/4.6/chms/ex…
#> $ start_date   <chr> "2021-05-30", "2021-05-27"
#> $ epoch_length <dbl> 15, 60

# Create participant meta (statcan users)
meta <- get_chms_meta(
  clinic_file = "path/to/clinic/file.sas7bdat",
  agd_dir = "path/to/agd/files/site",
  clinic_id = "CLINICID",
  site = "SITE",
  age = "CLC_AGE",
  day = "V2_DAY",
  month = "V2_MTH",
  year = "V2_YEAR"
)

# Initialize agd R6 class
agd_data <- agd$new(
  id = meta$id,
  age = meta$age,
  agd_lfe = meta$agd_lfe,
  agd_nml = meta$agd_nml,
  epoch_length = meta$epoch_length,
  day_max = 7,
  sleep_algo = "barreira",
  non_wear_algo = "barreira",
  start_date = meta$start_date,
  cpu_max = 2
)

# Print/examine
agd_data
#> 
#> ── 🍁chms::agd$print() method ──
#> 
#> Settings
#> 
#> # A tibble: 2 × 9
#>   id         age   agd_lfe agd_nml epoch_length day_max sleep_algo non_wear_algo
#>   <chr>      <chr> <chr>   <chr>   <chr>        <chr>   <chr>      <chr>        
#> 1 jane-canu… 10    C:/Use… C:/Use… 15           7       barreira   barreira     
#> 2 john-canu… 40    C:/Use… C:/Use… 60           7       barreira   barreira     
#> # ℹ 1 more variable: start_date <chr>
#> 
#> Log
#> 
#> # A tibble: 1 × 4
#>   method timestamp           status  message
#>   <chr>  <dttm>              <chr>   <chr>  
#> 1 new()  2026-10-05 13:17:31 success ""

# Run processing pipeline (load, clean, classify and summarize data)
agd_data$run()
#> 
#> ── 🍁chms::agd$run() method ──
#> 
#> ℹ Crunching data for 2 participants across 2 CPUs.
#> 
#> ■■■■■■■■■■■■■■■■                  50% | ETA:  7s
#> ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■  100% | ETA:  0s
#> ✔ Done!

# Export results
agd_data$export(dir = tempdir())
#> 
#> ── 🍁chms::agd$export() method ──
#> 
#> ℹ Exporting results to 'C:\Users\Clippy\AppData\Local\Temp\Rtmp8gHkW5/agd-run-2026-10-05-13-17-39-496406'.
#> 
#> ✔ Done!

# Export statcan-formatted results
agd_data$export(dir = tempdir(), stc = TRUE)
#> 
#> ── 🍁chms::agd$export() method ──
#> 
#> ℹ Exporting `self$results$summary_full_stc` and `self$results$summary_run` to 'C:\Users\Clippy\AppData\Local\Temp\Rtmp8gHkW5'.
#> 
#> ✔ Done!

# Get settings and pipeline run log
agd_data
#> 
#> ── 🍁chms::agd$print() method ──
#> 
#> Settings
#> 
#> # A tibble: 2 × 9
#>   id         age   agd_lfe agd_nml epoch_length day_max sleep_algo non_wear_algo
#>   <chr>      <chr> <chr>   <chr>   <chr>        <chr>   <chr>      <chr>        
#> 1 jane-canu… 10    C:/Use… C:/Use… 15           7       barreira   barreira     
#> 2 john-canu… 40    C:/Use… C:/Use… 60           7       barreira   barreira     
#> # ℹ 1 more variable: start_date <chr>
#> 
#> Log
#> 
#> # A tibble: 2 × 4
#>   method timestamp           status  message
#>   <chr>  <dttm>              <chr>   <chr>  
#> 1 new()  2026-10-05 13:17:31 success ""     
#> 2 run()  2026-10-05 13:17:39 success ""

# Plot data
plot(agd_data, id = "jane-canuck")
#> 
#> ── 🍁chms::plot(agd) method ──
#> 
#> ℹ Rendering scatter plot for participant `jane-canuck`


#> 
#> ✔ Done!

# Summarize data
summary(agd_data)
#> 
#> ── 🍁chms::summary(agd) method ──
#> 
#> Waking hours summary
#> Participant count: 2
#> 
#> # A tibble: 2 × 14
#>   participant_id device_serial_number wear_time  steps   lpa   mpa   vpa  mvpa
#>   <chr>          <chr>                    <dbl>  <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 jane-canuck    MOS2E26200432             14.7 10659.  251.  35.5  25.8  61.3
#> 2 john-canuck    MOS2E26200637             16.4 11166.  309.  32.4  17.9  50.3
#> # ℹ 6 more variables: lmvpa <dbl>, mpa_bouts <dbl>, vpa_bouts <dbl>,
#> #   mvpa_bouts <dbl>, sb <dbl>, valid_day <dbl>
#> 
#> Sleeping hours summary
#> Participant count: 2
#> 
#> # A tibble: 2 × 16
#>   participant_id device_serial_number wear_time sleep_period_time sleep_episodes
#>   <chr>          <chr>                    <dbl>             <dbl>          <dbl>
#> 1 jane-canuck    MOS2E26200432             9.32              9.63              1
#> 2 john-canuck    MOS2E26200637             7.28              7.28              1
#> # ℹ 11 more variables: nocturnal_sleep_midpoint <chr>, wake_episodes <dbl>,
#> #   total_wake_episode_time <dbl>, total_sleep_episode_time <dbl>,
#> #   sleep_episode_efficiency <dbl>, total_restful_sleep_time <dbl>,
#> #   sleep_episode_movements <dbl>, total_disrupted_sleep <dbl>,
#> #   restful_sleep_efficiency <dbl>, valid_day <dbl>, sleep_episode_log <chr>

# View all results in tab
agd_data$view()

# View specific results in tab
agd_data$view("summary_full")
agd_data$view("summary_full_stc")
agd_data$view("summary_run")
agd_data$view("summary_sleeping_hours")
agd_data$view("summary_waking_hours")

# View issues and run log
agd_data$view("issues")
agd_data$view("log")

# Store results in stand-alone data frames
summary_full <- agd_data$results$summary_full
summary_full_stc <- agd_data$results$summary_full_stc
summary_run <- agd_data$results$summary_run
summary_sleeping_hours <- agd_data$results$summary_sleeping_hours
summary_waking_hours <- agd_data$results$summary_waking_hours

# Render sanity check report
agd_data$sanity_check(dir = tempdir(), name = "My sanity check report")

Documentation

?agd

How to cite

citation("chms")
#> To cite chms in publications, please use:
#> 
#>   Clarke J, Gribbon A, St-Laurent M, Ferrao T, Barnes J, Kuzik N,
#>   Colley R (2026). "Comparison of physical activity and sedentary time
#>   measured with the ActiGraph GT3X-BT and Actical accelerometers."
#>   _Health Rep_, *18*(37(2)), 3-15.
#>   doi:10.25318/82-003-x202600200001-eng
#>   <https://doi.org/10.25318/82-003-x202600200001-eng>.
#> 
#> A BibTeX entry for LaTeX users is
#> 
#>   @Article{,
#>     title = {Comparison of physical activity and sedentary time measured with the ActiGraph GT3X-BT and Actical accelerometers},
#>     author = {J Clarke and A Gribbon and M St-Laurent and T Ferrao and J Barnes and N Kuzik and R Colley},
#>     journal = {Health Rep},
#>     year = {2026},
#>     volume = {18},
#>     number = {37(2)},
#>     pages = {3-15},
#>     doi = {10.25318/82-003-x202600200001-eng},
#>   }

Français

Vue d’ensemble

L’ECMS fournit des outils pour nettoyer et résumer les données de l’accéléromètre conforme aux méthodes appliquées au cycle 7 du Enquête canadienne sur les mesures de la santé (ECMS) :

  • agd$new() initialise une classe R6 avec des champs (données) et des méthodes (fonctions) pour le traitement Ametris (anciennement ActiGraph).
  • agd$run() exécute un pipeline qui appelle plusieurs méthodes : $load(), $clean(), $classify() et $summarize().
  • agd$sanity_check() Affiche un rapport de résumé au format HTML statistiques par participant.

L’ECMS exige :

  • deux fichiers ActiGraph (.agd) par participant, dont un traité avec le filtre normal (pour le nombre de pas) et l’autre traité avec le filtre faible Filtre d’extension de fréquence (pour tous les autres comportements de mouvement variables).
  • données de l’accéléromètre au niveau de l’époque de 15 secondes pour les participants ≤ 17 ans.
  • les données de l’accéléromètre au niveau de l’époque de 60 secondes ou moins pour participants ≥ 18 ans.
  • âge entier de chaque participant.

Par défaut, l’ECMS :

  • supprime les jours incomplets de données (< 24 heures).
  • détermine le temps de sommeil, le temps de port et le temps de non-port en appliquant le Barreira algorithme aux données au niveau de l’époque de 60 secondes.
  • recherche des périodes de sommeil à partir de 18 h (3 à 5 ans) ou de 19 h (6 ans et +).
  • détermine les comportements de mouvement pour les époques admissibles (époques antérieures classé comme temps de port et temps d’éveil) en appliquant ce qui suit Points de coupure du nombre d’accéléromètres de l’axe 1 à des niveaux d’époque spécifiques à l’âge :
Âge (années) Niveau d’époque (secondes) Point de coupure de SB (nombres) Point de coupure de l’APL (nombre) Point de coupure de l’AMP (nombre) Seuil de l’APV (nombre)
3-4 15 0-24Evenson 25-419Pate 420+Pate –
5-17 15 0-24Evenson 25-573Evenson 574-1,002Evenson 1,003+Evenson
18-64 60 0-99Troiano 100-2,019Troiano 2,020-5,998Troiano 5,999+Troiano
65+ 60 0-99Troiano 100-2,019Troiano 2,020-5,998Troiano 5,999+Troiano

SB : comportement sédentaire ; APL : physique d’intensité légère activité ; APM : activité physique d’intensité modérée ; APV : activité physique d’intensité vigoureuse.

  • valide les jours (≥ 10 heures de port et ≥ 100 pas). Jours invalides sont exclus des résultats des heures d’éveil.
  • valide les nuits de sommeil (≥ 160 minutes de sommeil). Nuits invalides de le sommeil sont exclus des résultats des heures de sommeil.

Pour plus de détails sur les méthodes utilisées dans l’ensemble R de l’ ECMS , voir Clarke J, Gribbon A, St-Laurent M, Ferrao T, Barnes J, Kuzik N, Colley R. Comparaison de l’activité physique et du temps consacré à des activités sédentaires mesurés à l’aide des accéléromètres ActiGraph GT3X-BT et Actical. Représentant de la santé 2026 févr. 18; 37(2):3-15. DOI : 10.25318/82-003-x202600200001-fra. PMID : 41730515.

L’installation

# Install official release (CRAN)
pak::pak("chms")

# Install development version (GitHub)
pak::pak("statcan/chms")

Utilisation

# Load dependencies into current R session
library(chms)
library(dplyr)

# Create participant meta (external/non-statcan users)
meta <- tibble(
  id = c("jane-canuck", "john-canuck"),
  age = c(10, 40),
  agd_lfe = c(
    system.file("extdata", "jane-canuck-lfe.agd", package = "chms"),
    system.file("extdata", "john-canuck-lfe.agd", package = "chms")
  ),
  agd_nml = c(
    system.file("extdata", "jane-canuck-nml.agd", package = "chms"),
    system.file("extdata", "john-canuck-nml.agd", package = "chms")
  ),
  start_date = c("2021-05-30", "2021-05-27"),
  epoch_length = c(15, 60)
)

# Print/examine
glimpse(meta)
#> Rows: 2
#> Columns: 6
#> $ id           <chr> "jane-canuck", "john-canuck"
#> $ age          <dbl> 10, 40
#> $ agd_lfe      <chr> "C:/Users/Clippy/Desktop/chms/inst/extdata/jane-c…
#> $ agd_nml      <chr> "C:/Users/Clippy/Desktop/chms/inst/extdata/jane-c…
#> $ start_date   <chr> "2021-05-30", "2021-05-27"
#> $ epoch_length <dbl> 15, 60

# Create participant meta (statcan users)
meta <- get_chms_meta(
  clinic_file = "path/to/clinic/file.sas7bdat",
  agd_dir = "path/to/agd/files/site",
  clinic_id = "CLINICID",
  site = "SITE",
  age = "CLC_AGE",
  day = "V2_DAY",
  month = "V2_MTH",
  year = "V2_YEAR"
)

# Initialize agd R6 class
agd_data <- agd$new(
  id = meta$id,
  age = meta$age,
  agd_lfe = meta$agd_lfe,
  agd_nml = meta$agd_nml,
  epoch_length = meta$epoch_length,
  day_max = 7,
  sleep_algo = "barreira",
  non_wear_algo = "barreira",
  start_date = meta$start_date,
  cpu_max = 2
)

# Print/examine
agd_data
#> 
#> ── 🍁chms::agd$print() method ──
#> 
#> Settings
#> 
#> # A tibble: 2 × 9
#>   id         age   agd_lfe agd_nml epoch_length day_max sleep_algo non_wear_algo
#>   <chr>      <chr> <chr>   <chr>   <chr>        <chr>   <chr>      <chr>        
#> 1 jane-canu… 10    C:/Use… C:/Use… 15           7       barreira   barreira     
#> 2 john-canu… 40    C:/Use… C:/Use… 60           7       barreira   barreira     
#> # ℹ 1 more variable: start_date <chr>
#> 
#> Log
#> 
#> # A tibble: 1 × 4
#>   method timestamp           status  message
#>   <chr>  <dttm>              <chr>   <chr>  
#> 1 new()  2026-10-05 13:17:54 success ""

# Run processing pipeline (load, clean, classify and summarize data)
agd_data$run()
#> 
#> ── 🍁chms::agd$run() method ──
#> 
#> ℹ Crunching data for 2 participants across 2 CPUs.
#> 
#> ■■■■■■■■■■■■■■■■                  50% | ETA:  7s
#> ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■  100% | ETA:  0s
#> ✔ Done!

# Export results
agd_data$export(dir = tempdir())
#> 
#> ── 🍁chms::agd$export() method ──
#> 
#> ℹ Exporting results to 'C:\Users\Clippy\AppData\Local\Temp\Rtmp8gHkW5/agd-run-2026-10-05-13-18-01-691848'.
#> 
#> ✔ Done!

# Export statcan-formatted results
agd_data$export(dir = tempdir(), stc = TRUE)
#> 
#> ── 🍁chms::agd$export() method ──
#> 
#> ℹ Exporting `self$results$summary_full_stc` and `self$results$summary_run` to 'C:\Users\Clippy\AppData\Local\Temp\Rtmp8gHkW5'.
#> 
#> ✔ Done!

# Get settings and pipeline run log
agd_data
#> 
#> ── 🍁chms::agd$print() method ──
#> 
#> Settings
#> 
#> # A tibble: 2 × 9
#>   id         age   agd_lfe agd_nml epoch_length day_max sleep_algo non_wear_algo
#>   <chr>      <chr> <chr>   <chr>   <chr>        <chr>   <chr>      <chr>        
#> 1 jane-canu… 10    C:/Use… C:/Use… 15           7       barreira   barreira     
#> 2 john-canu… 40    C:/Use… C:/Use… 60           7       barreira   barreira     
#> # ℹ 1 more variable: start_date <chr>
#> 
#> Log
#> 
#> # A tibble: 2 × 4
#>   method timestamp           status  message
#>   <chr>  <dttm>              <chr>   <chr>  
#> 1 new()  2026-10-05 13:17:54 success ""     
#> 2 run()  2026-10-05 13:18:01 success ""

# Plot data
plot(agd_data, id = "jane-canuck")
#> 
#> ── 🍁chms::plot(agd) method ──
#> 
#> ℹ Rendering scatter plot for participant `jane-canuck`


#> 
#> ✔ Done!

# Summarize data
summary(agd_data)
#> 
#> ── 🍁chms::summary(agd) method ──
#> 
#> Waking hours summary
#> Participant count: 2
#> 
#> # A tibble: 2 × 14
#>   participant_id device_serial_number wear_time  steps   lpa   mpa   vpa  mvpa
#>   <chr>          <chr>                    <dbl>  <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 jane-canuck    MOS2E26200432             14.7 10659.  251.  35.5  25.8  61.3
#> 2 john-canuck    MOS2E26200637             16.4 11166.  309.  32.4  17.9  50.3
#> # ℹ 6 more variables: lmvpa <dbl>, mpa_bouts <dbl>, vpa_bouts <dbl>,
#> #   mvpa_bouts <dbl>, sb <dbl>, valid_day <dbl>
#> 
#> Sleeping hours summary
#> Participant count: 2
#> 
#> # A tibble: 2 × 16
#>   participant_id device_serial_number wear_time sleep_period_time sleep_episodes
#>   <chr>          <chr>                    <dbl>             <dbl>          <dbl>
#> 1 jane-canuck    MOS2E26200432             9.32              9.63              1
#> 2 john-canuck    MOS2E26200637             7.28              7.28              1
#> # ℹ 11 more variables: nocturnal_sleep_midpoint <chr>, wake_episodes <dbl>,
#> #   total_wake_episode_time <dbl>, total_sleep_episode_time <dbl>,
#> #   sleep_episode_efficiency <dbl>, total_restful_sleep_time <dbl>,
#> #   sleep_episode_movements <dbl>, total_disrupted_sleep <dbl>,
#> #   restful_sleep_efficiency <dbl>, valid_day <dbl>, sleep_episode_log <chr>

# View all results in tab
agd_data$view()

# View specific results in tab
agd_data$view("summary_full")
agd_data$view("summary_full_stc")
agd_data$view("summary_run")
agd_data$view("summary_sleeping_hours")
agd_data$view("summary_waking_hours")

# View issues and run log
agd_data$view("issues")
agd_data$view("log")

# Store results in stand-alone data frames
summary_full <- agd_data$results$summary_full
summary_full_stc <- agd_data$results$summary_full_stc
summary_run <- agd_data$results$summary_run
summary_sleeping_hours <- agd_data$results$summary_sleeping_hours
summary_waking_hours <- agd_data$results$summary_waking_hours

# Render sanity check report
agd_data$sanity_check(dir = tempdir(), name = "My sanity check report")

Documentation

?agd

Comment citer

citation("chms")
#> To cite chms in publications, please use:
#> 
#>   Clarke J, Gribbon A, St-Laurent M, Ferrao T, Barnes J, Kuzik N,
#>   Colley R (2026). "Comparison of physical activity and sedentary time
#>   measured with the ActiGraph GT3X-BT and Actical accelerometers."
#>   _Health Rep_, *18*(37(2)), 3-15.
#>   doi:10.25318/82-003-x202600200001-eng
#>   <https://doi.org/10.25318/82-003-x202600200001-eng>.
#> 
#> A BibTeX entry for LaTeX users is
#> 
#>   @Article{,
#>     title = {Comparison of physical activity and sedentary time measured with the ActiGraph GT3X-BT and Actical accelerometers},
#>     author = {J Clarke and A Gribbon and M St-Laurent and T Ferrao and J Barnes and N Kuzik and R Colley},
#>     journal = {Health Rep},
#>     year = {2026},
#>     volume = {18},
#>     number = {37(2)},
#>     pages = {3-15},
#>     doi = {10.25318/82-003-x202600200001-eng},
#>   }

Reference manual

It appears you don't have a PDF plugin for this browser. You can click here to download the reference manual.
install.packages("chms")

7.2 by Joel Barnes, 3 days ago

https://github.com/statcan/chms

Report a bug at https://github.com/statcan/chms/issues

Browse source code at https://github.com/cran/chms

Authors: Joel Barnes [aut, cre] , Janine Clarke [ctb] , Rachel Colley [ctb] , His Majesty the King in Right of Canada , as represented by Statistics Canada [cph]

Documentation:   PDF Manual  

MIT + file LICENSE license

Imports cli, DBI, dbplyr, dplyr, haven, hms, jsonlite, knitr, lubridate, mirai, parallelly, purrr, R6, readr, rlang, RSQLite, stats, stringr, tidyr, utils, zoo

Suggests config, ggplot2, janitor, kableExtra, PhysicalActivity, quarto, scales, testthat, tibble

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