Data dictionary
Description of variables generated by process_nhanes function in nhanesaccel package.
Variable name | brevity | Description |
---|---|---|
seqn | 1+ | Participant ID number. |
nhanes_wave | 1+ | 1 if participant is from NHANES 2003-2004, 2 if NHANES 2005-2006. |
day | 1+ | Day of week (1 = Sunday, …, 7 = Saturday). |
valid_day | 1+ | 1 if day is considered valid for analysis, otherwise 0. |
valid_days | 1+ | Number of valid days. Only included in per-person summary. |
valid_week_days | 1+ | Number of valid weekdays. Only included in per-person summary. |
valid_weekend_days | 1+ | Number of valid weekend days. Only included in per-person summary. |
include | 1+ | 1 if participant is deemed to have valid data for analysis, otherwise 0. |
valid_min | 1+ | Number of minutes classified as valid wear time. |
counts | 1+ | Total counts accumulated during wear time minutes. |
cpm | 1+ | counts/valid_min. |
steps | 2+ | Total steps accumulated during weartime minutes. |
sed_min | 2+ | Sedentary minutes, or minutes with counts < int_cuts[1]. |
light_min | 2+ | Light intensity minutes, or minutes with int.cuts[1] <= counts < int.cuts[2]. |
life_min | 2+ | Lifestyle intensity minutes, or minutes with int.cuts[2] <= counts < int.cuts[3]. |
mod_min | 2+ | Moderate intensity minutes, or minutes with int.cuts[3] <= counts < int.cuts[4]. |
vig_min | 2+ | Vigorous intensity minutes, or minutes with counts >= int.cuts[4]. |
lightlife_min | 2+ | Light-to-lifestyle intensity minutes. |
mvpa_min | 2+ | Moderate-to-vigorous intensity minutes. |
active_min | 2+ | Active (i.e. non-sedentary) minutes. |
sed_percent | 2+ | sed_min/valid_min. |
light_percent | 2+ | light_min/valid_min. |
life_percent | 2+ | life_min/valid_min. |
mod_percent | 2+ | mod_min/valid_min. |
vig_percent | 2+ | vig_min/valid_min. |
lightlife_percent | 2+ | lightlife_min/valid_min. |
mvpa_percent | 2+ | mvpa_min/valid_min. |
active_percent | 2+ | active_min/valid_min. |
sed_counts | 2+ | Counts accumualted during sedentary time. |
light_counts | 2+ | Counts accumulated during light intensity activity. |
life_counts | 2+ | Counts accumulated during lifestyle intensity activity. |
mod_counts | 2+ | Counts accumulated during moderate intensity activity. |
vig_counts | 2+ | Counts accumulated during vigorous intensity activity. |
lightlife_counts | 2+ | Counts accumulated during light-to-lifestyle intensity activity. |
mvpa_counts | 2+ | Counts accumulated during MVPA. |
active_counts | 2+ | Counts accumulated during active (i.e. non-sedentary) time. |
sed_bouted_10min | 2+ | Sedentary minutes accumulated in bouts of length >= 10 min. |
sed_bouted_30min | 2+ | Sedentary minutes accumulated in bouts of length >= 30 min. |
sed_bouted_60min | 2+ | Sedentary minutes accumulated in bouts of length >= 60 min. |
sed_breaks | 2+ | Number of times participant transitions from sedentary to non-sedentary minute. |
max_1min_counts | 2+ | Maximum count value. |
max_5min_counts | 2+ | Maximum average count value over a 5-min interval. |
max_10min_counts | 2+ | Maximum average count value over a 10-min interval. |
max_30min_counts | 2+ | Maximum average count value over a 30-min interval. |
num_mvpa_bouts | 2+ | Number of MVPA bouts. |
num_vig_bouts | 2+ | Number of vigorous bouts. |
mvpa_bouted | 2+ | MVPA minutes accumulated in bouts of length >= active_bout_length. |
vig_bouted | 2+ | Vigorous intensity minutes accumulated in bouts of length >= active_bout_length |
guideline_min | 2+ | Minutes towards physical activity guidelines (150 min/wk of MVPA or 75 min/wk of VPA). |
hourly_var_hour1 | 3 | Value of hourly_var variable during hour 1 (midnight to 1 AM). |
hourly_var_hour2 | 3 | Value of hourly_var variable during hour 2. |
hourly_var_hour3 | 3 | Value of hourly_var variable during hour 3. |
hourly_var_hour4 | 3 | Value of hourly_var variable during hour 4. |
hourly_var_hour5 | 3 | Value of hourly_var variable during hour 5. |
hourly_var_hour6 | 3 | Value of hourly_var variable during hour 6. |
hourly_var_hour7 | 3 | Value of hourly_var variable during hour 7. |
hourly_var_hour8 | 3 | Value of hourly_var variable during hour 8. |
hourly_var_hour9 | 3 | Value of hourly_var variable during hour 9. |
hourly_var_hour10 | 3 | Value of hourly_var variable during hour 10. |
hourly_var_hour11 | 3 | Value of hourly_var variable during hour 11. |
hourly_var_hour12 | 3 | Value of hourly_var variable during hour 12. |
hourly_var_hour13 | 3 | Value of hourly_var variable during hour 13. |
hourly_var_hour14 | 3 | Value of hourly_var variable during hour 14. |
hourly_var_hour15 | 3 | Value of hourly_var variable during hour 15. |
hourly_var_hour16 | 3 | Value of hourly_var variable during hour 16. |
hourly_var_hour17 | 3 | Value of hourly_var variable during hour 17. |
hourly_var_hour18 | 3 | Value of hourly_var variable during hour 18. |
hourly_var_hour19 | 3 | Value of hourly_var variable during hour 19. |
hourly_var_hour20 | 3 | Value of hourly_var variable during hour 20. |
hourly_var_hour21 | 3 | Value of hourly_var variable during hour 21. |
hourly_var_hour22 | 3 | Value of hourly_var variable during hour 22. |
hourly_var_hour23 | 3 | Value of hourly_var variable during hour 23. |
hourly_var_hour24 | 3 | Value of hourly_var variable during hour 24 (11 PM to midnight). |
wtmec2yr_adj | 1+ | Adjusted MEC weight for analyzing 1 two-year NHANES cycle (e.g. 2003-2004). |
wtmec4yr_adj | 1+ | Adjusted MEC weight for analyzing 2 two-year NHANES cycles (e.g. 2003-2006). |